diff --git a/examples/cairo.c b/examples/cairo.c
index dff9bbd..8cae7a6 100644
--- a/examples/cairo.c
+++ b/examples/cairo.c
@@ -108,34 +108,12 @@ resize_area (GthreeArea *area,
 int
 main (int argc, char *argv[])
 {
-  GtkWidget *window, *box, *hbox, *button, *area;
+  GtkWidget *window, *box, *area;
   GthreeScene *scene;
   GthreePerspectiveCamera *camera;
   graphene_point3d_t pos;
 
-#ifdef USE_GTK4
-  gtk_init ();
-#else
-  gtk_init (&argc, &argv);
-#endif
-
-  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-  gtk_window_set_title (GTK_WINDOW (window), "Cairo textures");
-  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
-#ifdef USE_GTK3
-  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
-#endif
-  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
-
-  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (box), 6);
-  gtk_container_add (GTK_CONTAINER (window), box);
-  gtk_widget_show (box);
-
-  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (hbox), 6);
-  gtk_container_add (GTK_CONTAINER (box), hbox);
-  gtk_widget_show (hbox);
+  window = examples_init ("Cairo textures", &box);
 
   scene = init_scene ();
   camera = gthree_perspective_camera_new (30, 1, 1, 10000);
@@ -148,17 +126,11 @@ main (int argc, char *argv[])
   g_signal_connect (area, "resize", G_CALLBACK (resize_area), camera);
   gtk_widget_set_hexpand (area, TRUE);
   gtk_widget_set_vexpand (area, TRUE);
-  gtk_container_add (GTK_CONTAINER (hbox), area);
+  gtk_container_add (GTK_CONTAINER (box), area);
   gtk_widget_show (area);
 
   gtk_widget_add_tick_callback (GTK_WIDGET (area), tick, area, NULL);
 
-  button = gtk_button_new_with_label ("Quit");
-  gtk_widget_set_hexpand (button, TRUE);
-  gtk_container_add (GTK_CONTAINER (box), button);
-  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
-  gtk_widget_show (button);
-
   gtk_widget_show (window);
 
   gtk_main ();
diff --git a/examples/cubes.c b/examples/cubes.c
index d58183d..595a689 100644
--- a/examples/cubes.c
+++ b/examples/cubes.c
@@ -266,34 +266,12 @@ resize_area (GthreeArea *area,
 int
 main (int argc, char *argv[])
 {
-  GtkWidget *window, *box, *hbox, *button, *area;
+  GtkWidget *window, *box, *area;
   GthreeScene *scene;
   GthreePerspectiveCamera *camera;
   graphene_point3d_t pos;
 
-#ifdef USE_GTK4
-  gtk_init ();
-#else
-  gtk_init (&argc, &argv);
-#endif
-
-  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-  gtk_window_set_title (GTK_WINDOW (window), "Cubes");
-  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
-#ifdef USE_GTK3
-  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
-#endif
-  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
-
-  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (box), 6);
-  gtk_container_add (GTK_CONTAINER (window), box);
-  gtk_widget_show (box);
-
-  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (hbox), 6);
-  gtk_container_add (GTK_CONTAINER (box), hbox);
-  gtk_widget_show (hbox);
+  window = examples_init ("Cubes", &box);
 
   scene = init_scene ();
   camera = gthree_perspective_camera_new (30, 1, 1, 10000);
@@ -306,17 +284,11 @@ main (int argc, char *argv[])
   g_signal_connect (area, "resize", G_CALLBACK (resize_area), camera);
   gtk_widget_set_hexpand (area, TRUE);
   gtk_widget_set_vexpand (area, TRUE);
-  gtk_container_add (GTK_CONTAINER (hbox), area);
+  gtk_container_add (GTK_CONTAINER (box), area);
   gtk_widget_show (area);
 
   gtk_widget_add_tick_callback (GTK_WIDGET (area), tick, area, NULL);
 
-  button = gtk_button_new_with_label ("Quit");
-  gtk_widget_set_hexpand (button, TRUE);
-  gtk_container_add (GTK_CONTAINER (box), button);
-  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
-  gtk_widget_show (button);
-
   gtk_widget_show (window);
 
   gtk_main ();
diff --git a/examples/effects.c b/examples/effects.c
index 565b4fe..777cec9 100644
--- a/examples/effects.c
+++ b/examples/effects.c
@@ -288,31 +288,9 @@ pass_toggled (GtkToggleButton *toggle_button, GthreePass *pass)
 int
 main (int argc, char *argv[])
 {
-  GtkWidget *window, *box, *hbox, *button, *area, *check;
-
-#ifdef USE_GTK4
-  gtk_init ();
-#else
-  gtk_init (&argc, &argv);
-#endif
-
-  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-  gtk_window_set_title (GTK_WINDOW (window), "Effects");
-  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
-#ifdef USE_GTK3
-  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
-#endif
-  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
-
-  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (box), 6);
-  gtk_container_add (GTK_CONTAINER (window), box);
-  gtk_widget_show (box);
+  GtkWidget *window, *box, *hbox, *area, *check;
 
-  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (hbox), 6);
-  gtk_container_add (GTK_CONTAINER (box), hbox);
-  gtk_widget_show (hbox);
+  window = examples_init ("Effects", &box);
 
   init_scene ();
   init_scene2 ();
@@ -323,7 +301,7 @@ main (int argc, char *argv[])
   g_signal_connect (area, "render", G_CALLBACK (render_area), NULL);
   gtk_widget_set_hexpand (area, TRUE);
   gtk_widget_set_vexpand (area, TRUE);
-  gtk_container_add (GTK_CONTAINER (hbox), area);
+  gtk_container_add (GTK_CONTAINER (box), area);
   gtk_widget_show (area);
 
   gtk_widget_add_tick_callback (GTK_WIDGET (area), tick, area, NULL);
@@ -363,12 +341,6 @@ main (int argc, char *argv[])
   gtk_widget_show (check);
   g_signal_connect (check, "toggled", G_CALLBACK (pass_toggled), greyscale_pass);
 
-  button = gtk_button_new_with_label ("Quit");
-  gtk_widget_set_hexpand (button, TRUE);
-  gtk_container_add (GTK_CONTAINER (box), button);
-  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
-  gtk_widget_show (button);
-
   gtk_widget_show (window);
 
   gtk_main ();
diff --git a/examples/envmap.c b/examples/envmap.c
index d14c91f..7503952 100644
--- a/examples/envmap.c
+++ b/examples/envmap.c
@@ -137,33 +137,11 @@ resize_area (GthreeArea *area,
 int
 main (int argc, char *argv[])
 {
-  GtkWidget *window, *box, *hbox, *button, *area;
+  GtkWidget *window, *box, *area;
   GthreeScene *scene;
   graphene_point3d_t pos;
 
-#ifdef USE_GTK4
-  gtk_init ();
-#else
-  gtk_init (&argc, &argv);
-#endif
-
-  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-  gtk_window_set_title (GTK_WINDOW (window), "Environment map");
-  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
-#ifdef USE_GTK3
-  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
-#endif
-  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
-
-  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (box), 6);
-  gtk_container_add (GTK_CONTAINER (window), box);
-  gtk_widget_show (box);
-
-  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (hbox), 6);
-  gtk_container_add (GTK_CONTAINER (box), hbox);
-  gtk_widget_show (hbox);
+  window = examples_init ("Environment map", &box);
 
   scene = init_scene ();
   camera = gthree_perspective_camera_new (30, 1, 1, 5000);
@@ -176,17 +154,11 @@ main (int argc, char *argv[])
   g_signal_connect (area, "resize", G_CALLBACK (resize_area), camera);
   gtk_widget_set_hexpand (area, TRUE);
   gtk_widget_set_vexpand (area, TRUE);
-  gtk_container_add (GTK_CONTAINER (hbox), area);
+  gtk_container_add (GTK_CONTAINER (box), area);
   gtk_widget_show (area);
 
   gtk_widget_add_tick_callback (GTK_WIDGET (area), tick, area, NULL);
 
-  button = gtk_button_new_with_label ("Quit");
-  gtk_widget_set_hexpand (button, TRUE);
-  gtk_container_add (GTK_CONTAINER (box), button);
-  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
-  gtk_widget_show (button);
-
   gtk_widget_show (window);
 
   gtk_main ();
diff --git a/examples/gtklogo.c b/examples/gtklogo.c
index 658eb5c..1113804 100644
--- a/examples/gtklogo.c
+++ b/examples/gtklogo.c
@@ -233,34 +233,12 @@ resize_area (GthreeArea *area,
 int
 main (int argc, char *argv[])
 {
-  GtkWidget *window, *box, *hbox, *button, *area;
+  GtkWidget *window, *box, *area;
   GthreeScene *scene;
   GthreePerspectiveCamera *camera;
   graphene_point3d_t pos;
 
-#ifdef USE_GTK4
-  gtk_init ();
-#else
-  gtk_init (&argc, &argv);
-#endif
-
-  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
-  gtk_window_set_title (GTK_WINDOW (window), "GTK+ logo");
-#ifdef USE_GTK3
-  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
-#endif
-  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
-
-  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (box), 6);
-  gtk_container_add (GTK_CONTAINER (window), box);
-  gtk_widget_show (box);
-
-  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (hbox), 6);
-  gtk_container_add (GTK_CONTAINER (box), hbox);
-  gtk_widget_show (hbox);
+  window = examples_init ("GTK+ logo", &box);
 
   scene = init_scene ();
   camera = gthree_perspective_camera_new (30, 1, 1, 10000);
@@ -273,17 +251,11 @@ main (int argc, char *argv[])
   g_signal_connect (area, "resize", G_CALLBACK (resize_area), camera);
   gtk_widget_set_hexpand (area, TRUE);
   gtk_widget_set_vexpand (area, TRUE);
-  gtk_container_add (GTK_CONTAINER (hbox), area);
+  gtk_container_add (GTK_CONTAINER (box), area);
   gtk_widget_show (area);
 
   gtk_widget_add_tick_callback (GTK_WIDGET (area), tick, area, NULL);
 
-  button = gtk_button_new_with_label ("Quit");
-  gtk_widget_set_hexpand (button, TRUE);
-  gtk_container_add (GTK_CONTAINER (box), button);
-  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
-  gtk_widget_show (button);
-
   gtk_widget_show (window);
 
   gtk_main ();
diff --git a/examples/interactive.c b/examples/interactive.c
index 0cbe295..d102180 100644
--- a/examples/interactive.c
+++ b/examples/interactive.c
@@ -214,33 +214,11 @@ resize_area (GthreeArea *area,
 int
 main (int argc, char *argv[])
 {
-  GtkWidget *window, *box, *hbox, *button, *area;
+  GtkWidget *window, *box, *area;
   GthreeScene *scene;
   graphene_point3d_t pos;
 
-#ifdef USE_GTK4
-  gtk_init ();
-#else
-  gtk_init (&argc, &argv);
-#endif
-
-  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-  gtk_window_set_title (GTK_WINDOW (window), "Interactive");
-  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
-#ifdef USE_GTK3
-  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
-#endif
-  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
-
-  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (box), 6);
-  gtk_container_add (GTK_CONTAINER (window), box);
-  gtk_widget_show (box);
-
-  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (hbox), 6);
-  gtk_container_add (GTK_CONTAINER (box), hbox);
-  gtk_widget_show (hbox);
+  window = examples_init ("Interactive", &box);
 
   scene = init_scene ();
   camera = gthree_perspective_camera_new (70, 1, 1, 10000);
@@ -253,17 +231,11 @@ main (int argc, char *argv[])
   g_signal_connect (area, "resize", G_CALLBACK (resize_area), camera);
   gtk_widget_set_hexpand (area, TRUE);
   gtk_widget_set_vexpand (area, TRUE);
-  gtk_container_add (GTK_CONTAINER (hbox), area);
+  gtk_container_add (GTK_CONTAINER (box), area);
   gtk_widget_show (area);
 
   gtk_widget_add_tick_callback (GTK_WIDGET (area), tick, area, NULL);
 
-  button = gtk_button_new_with_label ("Quit");
-  gtk_widget_set_hexpand (button, TRUE);
-  gtk_container_add (GTK_CONTAINER (box), button);
-  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
-  gtk_widget_show (button);
-
   gtk_widget_show (window);
 
   gtk_main ();
diff --git a/examples/materials.c b/examples/materials.c
index cc2ba85..ac0387f 100644
--- a/examples/materials.c
+++ b/examples/materials.c
@@ -346,48 +346,20 @@ resize_area (GthreeArea *area,
 int
 main (int argc, char *argv[])
 {
-  GtkWidget *window, *box, *hbox, *button, *area;
-
-#ifdef USE_GTK4
-  gtk_init ();
-#else
-  gtk_init (&argc, &argv);
-#endif
-
-  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-  gtk_window_set_title (GTK_WINDOW (window), "Materials");
-  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
-#ifdef USE_GTK3
-  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
-#endif
-  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
-
-  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (box), 6);
-  gtk_container_add (GTK_CONTAINER (window), box);
-  gtk_widget_show (box);
-
-  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (hbox), 6);
-  gtk_container_add (GTK_CONTAINER (box), hbox);
-  gtk_widget_show (hbox);
+  GtkWidget *window, *box, *area;
+
+  window = examples_init ("Materials", &box);
 
   init_scene ();
   area = gthree_area_new (scene, GTHREE_CAMERA (camera));
   g_signal_connect (area, "resize", G_CALLBACK (resize_area), NULL);
   gtk_widget_set_hexpand (area, TRUE);
   gtk_widget_set_vexpand (area, TRUE);
-  gtk_container_add (GTK_CONTAINER (hbox), area);
+  gtk_container_add (GTK_CONTAINER (box), area);
   gtk_widget_show (area);
 
   gtk_widget_add_tick_callback (GTK_WIDGET (area), tick, area, NULL);
 
-  button = gtk_button_new_with_label ("Quit");
-  gtk_widget_set_hexpand (button, TRUE);
-  gtk_container_add (GTK_CONTAINER (box), button);
-  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
-  gtk_widget_show (button);
-
   gtk_widget_show (window);
 
   gtk_main ();
diff --git a/examples/model.c b/examples/model.c
index 621f856..c70dd0d 100644
--- a/examples/model.c
+++ b/examples/model.c
@@ -494,12 +494,6 @@ main (int argc, char *argv[])
     { "resource:///org/gnome/gthree-examples/models/RobotExpressive.glb", "Robot" },
   };
 
-#ifdef USE_GTK4
-  gtk_init ();
-#else
-  gtk_init (&argc, &argv);
-#endif
-
   env_maps = g_ptr_array_new_with_free_func (g_object_unref);
   for (i = 0; i < G_N_ELEMENTS (cubes); i++)
     {
@@ -514,23 +508,7 @@ main (int argc, char *argv[])
       g_ptr_array_add (env_maps, cube_texture);
     }
 
-  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-  gtk_window_set_title (GTK_WINDOW (window), "Models");
-  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
-#ifdef USE_GTK3
-  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
-#endif
-  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
-
-  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (box), 6);
-  gtk_container_add (GTK_CONTAINER (window), box);
-  gtk_widget_show (box);
-
-  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (hbox), 6);
-  gtk_container_add (GTK_CONTAINER (box), hbox);
-  gtk_widget_show (hbox);
+  window = examples_init ("Models", &box);
 
   area = gthree_area_new (NULL, NULL);
 
@@ -552,7 +530,7 @@ main (int argc, char *argv[])
 
   gtk_widget_set_hexpand (area, TRUE);
   gtk_widget_set_vexpand (area, TRUE);
-  gtk_container_add (GTK_CONTAINER (hbox), area);
+  gtk_container_add (GTK_CONTAINER (box), area);
   gtk_widget_show (area);
 
   gtk_widget_add_tick_callback (GTK_WIDGET (area), tick, area, NULL);
@@ -612,18 +590,12 @@ main (int argc, char *argv[])
   gtk_widget_show (check);
   g_signal_connect (check, "toggled", G_CALLBACK (fade_animations_toggled), NULL);
 
-  morph_scale =scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL, 0, 1.0, 0.01);
+  morph_scale = scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL, 0, 1.0, 0.01);
   gtk_widget_set_size_request (scale, 100, -1);
   gtk_container_add (GTK_CONTAINER (hbox), scale);
   gtk_widget_show (scale);
   g_signal_connect (morph_scale, "value-changed", G_CALLBACK (morph_scale_changed), NULL);
 
-  button = gtk_button_new_with_label ("Quit");
-  gtk_widget_set_hexpand (button, TRUE);
-  gtk_container_add (GTK_CONTAINER (box), button);
-  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
-  gtk_widget_show (button);
-
   gtk_widget_show (window);
 
   update_scene (GTHREE_AREA (area));
diff --git a/examples/morphtargets.c b/examples/morphtargets.c
index f205d24..7f13596 100644
--- a/examples/morphtargets.c
+++ b/examples/morphtargets.c
@@ -95,34 +95,12 @@ resize_area (GthreeArea *area,
 int
 main (int argc, char *argv[])
 {
-  GtkWidget *window, *box, *hbox, *button, *area;
+  GtkWidget *window, *box, *area;
   GthreeScene *scene;
   GthreePerspectiveCamera *camera;
   graphene_point3d_t pos;
 
-#ifdef USE_GTK4
-  gtk_init ();
-#else
-  gtk_init (&argc, &argv);
-#endif
-
-  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-  gtk_window_set_title (GTK_WINDOW (window), "Morph targets");
-  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
-#ifdef USE_GTK3
-  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
-#endif
-  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
-
-  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (box), 6);
-  gtk_container_add (GTK_CONTAINER (window), box);
-  gtk_widget_show (box);
-
-  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (hbox), 6);
-  gtk_container_add (GTK_CONTAINER (box), hbox);
-  gtk_widget_show (hbox);
+  window = examples_init ("Morph targets", &box);
 
   scene = init_scene ();
   camera = gthree_perspective_camera_new (30, 1, 1, 10000);
@@ -135,17 +113,11 @@ main (int argc, char *argv[])
   g_signal_connect (area, "resize", G_CALLBACK (resize_area), camera);
   gtk_widget_set_hexpand (area, TRUE);
   gtk_widget_set_vexpand (area, TRUE);
-  gtk_container_add (GTK_CONTAINER (hbox), area);
+  gtk_container_add (GTK_CONTAINER (box), area);
   gtk_widget_show (area);
 
   gtk_widget_add_tick_callback (GTK_WIDGET (area), tick, area, NULL);
 
-  button = gtk_button_new_with_label ("Quit");
-  gtk_widget_set_hexpand (button, TRUE);
-  gtk_container_add (GTK_CONTAINER (box), button);
-  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
-  gtk_widget_show (button);
-
   gtk_widget_show (window);
 
   gtk_main ();
diff --git a/examples/multi.c b/examples/multi.c
index 99b8932..5ecfbc1 100644
--- a/examples/multi.c
+++ b/examples/multi.c
@@ -174,39 +174,17 @@ resize_area (GthreeArea *area,
 int
 main (int argc, char *argv[])
 {
-  GtkWidget *window, *box, *hbox, *button, *grid;
+  GtkWidget *window, *box, *grid;
   GthreeScene *scene;
   graphene_point3d_t pos;
   graphene_euler_t euler;
 
-#ifdef USE_GTK4
-  gtk_init ();
-#else
-  gtk_init (&argc, &argv);
-#endif
-
-  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-  gtk_window_set_title (GTK_WINDOW (window), "Multi views");
-  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
-#ifdef USE_GTK3
-  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
-#endif
-  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
-
-  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (box), 6);
-  gtk_container_add (GTK_CONTAINER (window), box);
-  gtk_widget_show (box);
-
-  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (hbox), 6);
-  gtk_container_add (GTK_CONTAINER (box), hbox);
-  gtk_widget_show (hbox);
+  window = examples_init ("Multi views", &box);
 
   scene = init_scene ();
 
   grid = gtk_grid_new ();
-  gtk_container_add (GTK_CONTAINER (hbox), grid);
+  gtk_container_add (GTK_CONTAINER (box), grid);
   gtk_widget_show (grid);
   gtk_grid_set_row_homogeneous (GTK_GRID (grid), TRUE);
   gtk_grid_set_row_spacing (GTK_GRID (grid), 6);
@@ -268,12 +246,6 @@ main (int argc, char *argv[])
 
   gtk_widget_add_tick_callback (GTK_WIDGET (area_z), tick, NULL, NULL);
 
-  button = gtk_button_new_with_label ("Quit");
-  gtk_widget_set_hexpand (button, TRUE);
-  gtk_container_add (GTK_CONTAINER (box), button);
-  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
-  gtk_widget_show (button);
-
   gtk_widget_show (window);
 
   gtk_main ();
diff --git a/examples/normals.c b/examples/normals.c
index f1c7191..d9c490d 100644
--- a/examples/normals.c
+++ b/examples/normals.c
@@ -153,34 +153,12 @@ resize_area (GthreeArea *area,
 int
 main (int argc, char *argv[])
 {
-  GtkWidget *window, *box, *hbox, *button, *area;
+  GtkWidget *window, *box, *area;
   GthreeScene *scene;
   GthreePerspectiveCamera *camera;
   graphene_point3d_t pos;
 
-#ifdef USE_GTK4
-  gtk_init ();
-#else
-  gtk_init (&argc, &argv);
-#endif
-
-  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
-  gtk_window_set_title (GTK_WINDOW (window), "Normals");
-#ifdef USE_GTK3
-  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
-#endif
-  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
-
-  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (box), 6);
-  gtk_container_add (GTK_CONTAINER (window), box);
-  gtk_widget_show (box);
-
-  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (hbox), 6);
-  gtk_container_add (GTK_CONTAINER (box), hbox);
-  gtk_widget_show (hbox);
+  window = examples_init ("Normals", &box);
 
   scene = init_scene ();
   camera = gthree_perspective_camera_new (30, 1, 1, 10000);
@@ -193,17 +171,11 @@ main (int argc, char *argv[])
   g_signal_connect (area, "resize", G_CALLBACK (resize_area), camera);
   gtk_widget_set_hexpand (area, TRUE);
   gtk_widget_set_vexpand (area, TRUE);
-  gtk_container_add (GTK_CONTAINER (hbox), area);
+  gtk_container_add (GTK_CONTAINER (box), area);
   gtk_widget_show (area);
 
   gtk_widget_add_tick_callback (GTK_WIDGET (area), tick, area, NULL);
 
-  button = gtk_button_new_with_label ("Quit");
-  gtk_widget_set_hexpand (button, TRUE);
-  gtk_container_add (GTK_CONTAINER (box), button);
-  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
-  gtk_widget_show (button);
-
   gtk_widget_show (window);
 
   gtk_main ();
diff --git a/examples/performance.c b/examples/performance.c
index 5a3ac25..092b7ef 100644
--- a/examples/performance.c
+++ b/examples/performance.c
@@ -113,33 +113,11 @@ motion_event (GtkWidget      *widget,
 int
 main (int argc, char *argv[])
 {
-  GtkWidget *window, *box, *hbox, *button, *area;
+  GtkWidget *window, *box, *area;
   GthreeScene *scene;
   graphene_point3d_t pos;
 
-#ifdef USE_GTK4
-  gtk_init ();
-#else
-  gtk_init (&argc, &argv);
-#endif
-
-  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-  gtk_window_set_title (GTK_WINDOW (window), "Performance");
-  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
-#ifdef USE_GTK3
-  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
-#endif
-  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
-
-  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (box), 6);
-  gtk_container_add (GTK_CONTAINER (window), box);
-  gtk_widget_show (box);
-
-  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (hbox), 6);
-  gtk_container_add (GTK_CONTAINER (box), hbox);
-  gtk_widget_show (hbox);
+  window = examples_init ("Performance", &box);
 
   scene = init_scene ();
   camera = gthree_perspective_camera_new (60, 1, 1, 10000);
@@ -154,17 +132,11 @@ main (int argc, char *argv[])
   g_signal_connect (area, "motion-notify-event", G_CALLBACK (motion_event), NULL);
   gtk_widget_set_hexpand (area, TRUE);
   gtk_widget_set_vexpand (area, TRUE);
-  gtk_container_add (GTK_CONTAINER (hbox), area);
+  gtk_container_add (GTK_CONTAINER (box), area);
   gtk_widget_show (area);
 
   gtk_widget_add_tick_callback (GTK_WIDGET (area), tick, area, NULL);
 
-  button = gtk_button_new_with_label ("Quit");
-  gtk_widget_set_hexpand (button, TRUE);
-  gtk_container_add (GTK_CONTAINER (box), button);
-  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
-  gtk_widget_show (button);
-
   gtk_widget_show (window);
 
   gtk_main ();
diff --git a/examples/points.c b/examples/points.c
index d59b8a7..f974266 100644
--- a/examples/points.c
+++ b/examples/points.c
@@ -157,34 +157,12 @@ resize_area (GthreeArea *area,
 int
 main (int argc, char *argv[])
 {
-  GtkWidget *window, *box, *hbox, *button, *area;
+  GtkWidget *window, *box, *area;
   GthreeScene *scene;
   GthreePerspectiveCamera *camera;
   graphene_point3d_t pos;
 
-#ifdef USE_GTK4
-  gtk_init ();
-#else
-  gtk_init (&argc, &argv);
-#endif
-
-  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-  gtk_window_set_title (GTK_WINDOW (window), "Points");
-  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
-#ifdef USE_GTK3
-  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
-#endif
-  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
-
-  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (box), 6);
-  gtk_container_add (GTK_CONTAINER (window), box);
-  gtk_widget_show (box);
-
-  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (hbox), 6);
-  gtk_container_add (GTK_CONTAINER (box), hbox);
-  gtk_widget_show (hbox);
+  window = examples_init ("Points", &box);
 
   scene = init_scene ();
   camera = gthree_perspective_camera_new (27, 1, 5, 3500);
@@ -197,17 +175,11 @@ main (int argc, char *argv[])
   g_signal_connect (area, "resize", G_CALLBACK (resize_area), camera);
   gtk_widget_set_hexpand (area, TRUE);
   gtk_widget_set_vexpand (area, TRUE);
-  gtk_container_add (GTK_CONTAINER (hbox), area);
+  gtk_container_add (GTK_CONTAINER (box), area);
   gtk_widget_show (area);
 
   gtk_widget_add_tick_callback (GTK_WIDGET (area), tick, area, NULL);
 
-  button = gtk_button_new_with_label ("Quit");
-  gtk_widget_set_hexpand (button, TRUE);
-  gtk_container_add (GTK_CONTAINER (box), button);
-  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
-  gtk_widget_show (button);
-
   gtk_widget_show (window);
 
   gtk_main ();
diff --git a/examples/properties.c b/examples/properties.c
index 094d6de..9433c55 100644
--- a/examples/properties.c
+++ b/examples/properties.c
@@ -249,35 +249,13 @@ material_combo_changed (GtkComboBox *combo_box)
 int
 main (int argc, char *argv[])
 {
-  GtkWidget *window, *box, *hbox, *button, *area, *sw, *combo;
+  GtkWidget *window, *box, *area, *sw, *combo;
   GthreeScene *scene;
   GthreePerspectiveCamera *camera;
   graphene_point3d_t pos;
   int i;
 
-#ifdef USE_GTK4
-  gtk_init ();
-#else
-  gtk_init (&argc, &argv);
-#endif
-
-  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
-  gtk_window_set_title (GTK_WINDOW (window), "Properties");
-#ifdef USE_GTK3
-  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
-#endif
-  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
-
-  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (box), 6);
-  gtk_container_add (GTK_CONTAINER (window), box);
-  gtk_widget_show (box);
-
-  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (hbox), 6);
-  gtk_container_add (GTK_CONTAINER (box), hbox);
-  gtk_widget_show (hbox);
+  window = examples_init ("Properties", &box);
 
   scene = init_scene ();
   camera = gthree_perspective_camera_new (30, 1, 1, 10000);
@@ -290,7 +268,7 @@ main (int argc, char *argv[])
   g_signal_connect (area, "resize", G_CALLBACK (resize_area), camera);
   gtk_widget_set_hexpand (area, TRUE);
   gtk_widget_set_vexpand (area, TRUE);
-  gtk_container_add (GTK_CONTAINER (hbox), area);
+  gtk_container_add (GTK_CONTAINER (box), area);
   gtk_widget_show (area);
 
   gtk_widget_add_tick_callback (GTK_WIDGET (area), tick, area, NULL);
@@ -313,12 +291,6 @@ main (int argc, char *argv[])
 
   property_pane = sw;
 
-  button = gtk_button_new_with_label ("Quit");
-  gtk_widget_set_hexpand (button, TRUE);
-  gtk_container_add (GTK_CONTAINER (box), button);
-  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
-  gtk_widget_show (button);
-
   gtk_widget_show (window);
 
   update_property_pane ();
diff --git a/examples/rendertarget.c b/examples/rendertarget.c
index 78a76a5..f1f79be 100644
--- a/examples/rendertarget.c
+++ b/examples/rendertarget.c
@@ -135,31 +135,9 @@ render_area (GtkGLArea    *gl_area,
 int
 main (int argc, char *argv[])
 {
-  GtkWidget *window, *box, *hbox, *button, *area;
-
-#ifdef USE_GTK4
-  gtk_init ();
-#else
-  gtk_init (&argc, &argv);
-#endif
-
-  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-  gtk_window_set_title (GTK_WINDOW (window), "Render targets");
-  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
-#ifdef USE_GTK3
-  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
-#endif
-  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
-
-  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (box), 6);
-  gtk_container_add (GTK_CONTAINER (window), box);
-  gtk_widget_show (box);
-
-  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (hbox), 6);
-  gtk_container_add (GTK_CONTAINER (box), hbox);
-  gtk_widget_show (hbox);
+  GtkWidget *window, *box, *area;
+
+  window = examples_init ("Render targets", &box);
 
   init_scene ();
 
@@ -168,17 +146,11 @@ main (int argc, char *argv[])
   g_signal_connect (area, "render", G_CALLBACK (render_area), NULL);
   gtk_widget_set_hexpand (area, TRUE);
   gtk_widget_set_vexpand (area, TRUE);
-  gtk_container_add (GTK_CONTAINER (hbox), area);
+  gtk_container_add (GTK_CONTAINER (box), area);
   gtk_widget_show (area);
 
   gtk_widget_add_tick_callback (GTK_WIDGET (area), tick, area, NULL);
 
-  button = gtk_button_new_with_label ("Quit");
-  gtk_widget_set_hexpand (button, TRUE);
-  gtk_container_add (GTK_CONTAINER (box), button);
-  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
-  gtk_widget_show (button);
-
   gtk_widget_show (window);
 
   gtk_main ();
diff --git a/examples/shader.c b/examples/shader.c
index c4dcf59..b3e7f62 100644
--- a/examples/shader.c
+++ b/examples/shader.c
@@ -276,34 +276,12 @@ resize_area (GthreeArea *area,
 int
 main (int argc, char *argv[])
 {
-  GtkWidget *window, *box, *hbox, *button, *area;
+  GtkWidget *window, *box, *area;
   GthreeScene *scene;
   GthreePerspectiveCamera *camera;
   graphene_point3d_t pos;
 
-#ifdef USE_GTK4
-  gtk_init ();
-#else
-  gtk_init (&argc, &argv);
-#endif
-
-  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-  gtk_window_set_title (GTK_WINDOW (window), "Shader");
-  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
-#ifdef USE_GTK3
-  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
-#endif
-  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
-
-  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (box), 6);
-  gtk_container_add (GTK_CONTAINER (window), box);
-  gtk_widget_show (box);
-
-  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (hbox), 6);
-  gtk_container_add (GTK_CONTAINER (box), hbox);
-  gtk_widget_show (hbox);
+  window = examples_init ("Shaders", &box);
 
   scene = init_scene ();
   camera = gthree_perspective_camera_new (30, 1, 1, 10000);
@@ -316,17 +294,11 @@ main (int argc, char *argv[])
   g_signal_connect (area, "resize", G_CALLBACK (resize_area), camera);
   gtk_widget_set_hexpand (area, TRUE);
   gtk_widget_set_vexpand (area, TRUE);
-  gtk_container_add (GTK_CONTAINER (hbox), area);
+  gtk_container_add (GTK_CONTAINER (box), area);
   gtk_widget_show (area);
 
   gtk_widget_add_tick_callback (GTK_WIDGET (area), tick, area, NULL);
 
-  button = gtk_button_new_with_label ("Quit");
-  gtk_widget_set_hexpand (button, TRUE);
-  gtk_container_add (GTK_CONTAINER (box), button);
-  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
-  gtk_widget_show (button);
-
   gtk_widget_show (window);
 
   gtk_main ();
diff --git a/examples/shadow.c b/examples/shadow.c
index 7946d6c..c80925e 100644
--- a/examples/shadow.c
+++ b/examples/shadow.c
@@ -192,31 +192,9 @@ realize_area (GthreeArea *area)
 int
 main (int argc, char *argv[])
 {
-  GtkWidget *window, *box, *hbox, *button, *area;
-
-#ifdef USE_GTK4
-  gtk_init ();
-#else
-  gtk_init (&argc, &argv);
-#endif
-
-  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-  gtk_window_set_title (GTK_WINDOW (window), "Shadows");
-  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
-#ifdef USE_GTK3
-  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
-#endif
-  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
-
-  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (box), 6);
-  gtk_container_add (GTK_CONTAINER (window), box);
-  gtk_widget_show (box);
-
-  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (hbox), 6);
-  gtk_container_add (GTK_CONTAINER (box), hbox);
-  gtk_widget_show (hbox);
+  GtkWidget *window, *box, *area;
+
+  window = examples_init ("Shadows", &box);
 
   init_scene ();
   area = gthree_area_new (scene, GTHREE_CAMERA (camera));
@@ -224,17 +202,11 @@ main (int argc, char *argv[])
   g_signal_connect_after (area, "realize", G_CALLBACK (realize_area), NULL);
   gtk_widget_set_hexpand (area, TRUE);
   gtk_widget_set_vexpand (area, TRUE);
-  gtk_container_add (GTK_CONTAINER (hbox), area);
+  gtk_container_add (GTK_CONTAINER (box), area);
   gtk_widget_show (area);
 
   gtk_widget_add_tick_callback (GTK_WIDGET (area), tick, area, NULL);
 
-  button = gtk_button_new_with_label ("Quit");
-  gtk_widget_set_hexpand (button, TRUE);
-  gtk_container_add (GTK_CONTAINER (box), button);
-  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
-  gtk_widget_show (button);
-
   gtk_widget_show (window);
 
   gtk_main ();
diff --git a/examples/skinning.c b/examples/skinning.c
index 2343458..fcacb6d 100644
--- a/examples/skinning.c
+++ b/examples/skinning.c
@@ -218,36 +218,14 @@ resize_area (GthreeArea *area,
 int
 main (int argc, char *argv[])
 {
-  GtkWidget *window, *box, *hbox, *button, *area;
+  GtkWidget *window, *box, *area;
   GthreeScene *scene;
   GthreePerspectiveCamera *camera;
   graphene_point3d_t pos;
   GthreeAmbientLight *ambient_light;
   GthreeDirectionalLight *directional_light;
 
-#ifdef USE_GTK4
-  gtk_init ();
-#else
-  gtk_init (&argc, &argv);
-#endif
-
-  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-  gtk_window_set_title (GTK_WINDOW (window), "Skinning");
-  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
-#ifdef USE_GTK3
-  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
-#endif
-  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
-
-  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (box), 6);
-  gtk_container_add (GTK_CONTAINER (window), box);
-  gtk_widget_show (box);
-
-  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (hbox), 6);
-  gtk_container_add (GTK_CONTAINER (box), hbox);
-  gtk_widget_show (hbox);
+  window = examples_init ("Skinning", &box);
 
   scene = init_scene ();
 
@@ -272,17 +250,11 @@ main (int argc, char *argv[])
   g_signal_connect (area, "resize", G_CALLBACK (resize_area), camera);
   gtk_widget_set_hexpand (area, TRUE);
   gtk_widget_set_vexpand (area, TRUE);
-  gtk_container_add (GTK_CONTAINER (hbox), area);
+  gtk_container_add (GTK_CONTAINER (box), area);
   gtk_widget_show (area);
 
   gtk_widget_add_tick_callback (GTK_WIDGET (area), tick, area, NULL);
 
-  button = gtk_button_new_with_label ("Quit");
-  gtk_widget_set_hexpand (button, TRUE);
-  gtk_container_add (GTK_CONTAINER (box), button);
-  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
-  gtk_widget_show (button);
-
   gtk_widget_show (window);
 
   gtk_main ();
diff --git a/examples/sprites.c b/examples/sprites.c
index cc624d8..f26e5c0 100644
--- a/examples/sprites.c
+++ b/examples/sprites.c
@@ -346,33 +346,11 @@ render_area (GtkGLArea    *gl_area,
 int
 main (int argc, char *argv[])
 {
-  GtkWidget *window, *box, *hbox, *button, *area;
+  GtkWidget *window, *box, *area;
   GthreeScene *scene;
   graphene_point3d_t pos;
 
-#ifdef USE_GTK4
-  gtk_init ();
-#else
-  gtk_init (&argc, &argv);
-#endif
-
-  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-  gtk_window_set_title (GTK_WINDOW (window), "Sprites");
-  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
-#ifdef USE_GTK3
-  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
-#endif
-  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
-
-  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (box), 6);
-  gtk_container_add (GTK_CONTAINER (window), box);
-  gtk_widget_show (box);
-
-  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (hbox), 6);
-  gtk_container_add (GTK_CONTAINER (box), hbox);
-  gtk_widget_show (hbox);
+  window = examples_init ("Sprites", &box);
 
   scene = init_scene (window);
   camera = gthree_perspective_camera_new (60, 1, 1, 2100);
@@ -393,17 +371,11 @@ main (int argc, char *argv[])
   g_signal_connect (area, "render", G_CALLBACK (render_area), NULL);
   gtk_widget_set_hexpand (area, TRUE);
   gtk_widget_set_vexpand (area, TRUE);
-  gtk_container_add (GTK_CONTAINER (hbox), area);
+  gtk_container_add (GTK_CONTAINER (box), area);
   gtk_widget_show (area);
 
   gtk_widget_add_tick_callback (GTK_WIDGET (area), tick, area, NULL);
 
-  button = gtk_button_new_with_label ("Quit");
-  gtk_widget_set_hexpand (button, TRUE);
-  gtk_container_add (GTK_CONTAINER (box), button);
-  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
-  gtk_widget_show (button);
-
   gtk_widget_show (window);
 
   gtk_main ();
diff --git a/examples/testanimation.c b/examples/testanimation.c
index eb23884..f69c6ad 100644
--- a/examples/testanimation.c
+++ b/examples/testanimation.c
@@ -127,34 +127,12 @@ resize_area (GthreeArea *area,
 int
 main (int argc, char *argv[])
 {
-  GtkWidget *window, *box, *hbox, *button, *area;
+  GtkWidget *window, *box, *area;
   GthreeScene *scene;
   GthreePerspectiveCamera *camera;
   graphene_point3d_t pos;
 
-#ifdef USE_GTK4
-  gtk_init ();
-#else
-  gtk_init (&argc, &argv);
-#endif
-
-  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
-  gtk_window_set_title (GTK_WINDOW (window), "Animations");
-#ifdef USE_GTK3
-  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
-#endif
-  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
-
-  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (box), 6);
-  gtk_container_add (GTK_CONTAINER (window), box);
-  gtk_widget_show (box);
-
-  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, FALSE);
-  gtk_box_set_spacing (GTK_BOX (hbox), 6);
-  gtk_container_add (GTK_CONTAINER (box), hbox);
-  gtk_widget_show (hbox);
+  window = examples_init ("Animations", &box);
 
   scene = init_scene ();
   camera = gthree_perspective_camera_new (30, 1, 1, 10000);
@@ -167,17 +145,11 @@ main (int argc, char *argv[])
   g_signal_connect (area, "resize", G_CALLBACK (resize_area), camera);
   gtk_widget_set_hexpand (area, TRUE);
   gtk_widget_set_vexpand (area, TRUE);
-  gtk_container_add (GTK_CONTAINER (hbox), area);
+  gtk_container_add (GTK_CONTAINER (box), area);
   gtk_widget_show (area);
 
   gtk_widget_add_tick_callback (GTK_WIDGET (area), tick, area, NULL);
 
-  button = gtk_button_new_with_label ("Quit");
-  gtk_widget_set_hexpand (button, TRUE);
-  gtk_container_add (GTK_CONTAINER (box), button);
-  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
-  gtk_widget_show (button);
-
   gtk_widget_show (window);
 
   gtk_main ();
diff --git a/examples/utils.c b/examples/utils.c
index eb5a62f..d69be16 100644
--- a/examples/utils.c
+++ b/examples/utils.c
@@ -163,3 +163,56 @@ examples_load_gltl (const char *name, GError **error)
 
   return loader;
 }
+
+GtkWidget *
+examples_init (const char *title,
+               GtkWidget **box)
+{
+  GtkWidget *window, *outer_box, *button;
+  g_autofree char *full_title = NULL;
+
+#ifdef USE_GTK4
+  gtk_init ();
+#else
+  gtk_init (NULL, NULL);
+#endif
+
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  full_title = g_strdup_printf ("%s - %s", title,
+#ifdef USE_GTK4
+                                "gtk 4"
+#else
+                                "gtk 3"
+#endif
+                                );
+  gtk_window_set_title (GTK_WINDOW (window), full_title);
+  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
+#ifdef USE_GTK3
+  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
+#endif
+  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
+
+  outer_box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
+  gtk_box_set_spacing (GTK_BOX (outer_box), 6);
+#ifdef USE_GTK4
+  gtk_widget_set_margin_start (GTK_WIDGET (outer_box), 12);
+  gtk_widget_set_margin_end (GTK_WIDGET (outer_box), 12);
+  gtk_widget_set_margin_top (GTK_WIDGET (outer_box), 12);
+  gtk_widget_set_margin_bottom (GTK_WIDGET (outer_box), 12);
+#endif
+  gtk_container_add (GTK_CONTAINER (window), outer_box);
+  gtk_widget_show (outer_box);
+
+  *box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
+  gtk_box_set_spacing (GTK_BOX (*box), 6);
+  gtk_container_add (GTK_CONTAINER (outer_box), *box);
+  gtk_widget_show (*box);
+
+  button = gtk_button_new_with_label ("Quit");
+  gtk_widget_set_hexpand (button, TRUE);
+  gtk_container_add (GTK_CONTAINER (outer_box), button);
+  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
+  gtk_widget_show (button);
+
+  return window;
+}
diff --git a/examples/utils.h b/examples/utils.h
index e711945..5a0003c 100644
--- a/examples/utils.h
+++ b/examples/utils.h
@@ -1,5 +1,6 @@
 #include <gthree/gthree.h>
 #include <gthree/gthreearea.h>
+#include <gtk/gtk.h>
 
 GdkPixbuf *examples_load_pixbuf (const char *file);
 GthreeGeometry *examples_load_geometry (const char *name);
@@ -23,3 +24,6 @@ const graphene_vec3_t *grey (void);
 const graphene_vec3_t *light_grey (void);
 const graphene_vec3_t *dark_green (void);
 const graphene_vec3_t *orange (void);
+
+GtkWidget *examples_init (const char *title,
+                          GtkWidget **box);