diff --git a/doomsday/client/include/ui/widgets/scrollareawidget.h b/doomsday/client/include/ui/widgets/scrollareawidget.h
index 96d2fea552..f460369ffc 100644
--- a/doomsday/client/include/ui/widgets/scrollareawidget.h
+++ b/doomsday/client/include/ui/widgets/scrollareawidget.h
@@ -47,6 +47,7 @@ class ScrollAreaWidget : public GuiWidget
     void setContentWidth(de::Rule const &width);
     void setContentHeight(int height);
     void setContentHeight(de::Rule const &height);
+    void setContentSize(de::Rule const &width, de::Rule const &height);
     void setContentSize(de::Vector2i const &size);
 
     void modifyContentWidth(int delta);
diff --git a/doomsday/client/src/ui/widgets/aboutdialog.cpp b/doomsday/client/src/ui/widgets/aboutdialog.cpp
index 3045056323..aa7bb71ac0 100644
--- a/doomsday/client/src/ui/widgets/aboutdialog.cpp
+++ b/doomsday/client/src/ui/widgets/aboutdialog.cpp
@@ -85,8 +85,7 @@ AboutDialog::AboutDialog() : DialogWidget("about")
             .setAnchorPoint(Vector2f(.5f, 0));
 
     // Total size of the dialog's content.
-    area().setContentWidth(layout.width());
-    area().setContentHeight(layout.height() + homepage->rule().height());
+    area().setContentSize(layout.width(), layout.height() + homepage->rule().height());
 
     buttons().items()
             << new DialogButtonItem(DialogWidget::Accept | DialogWidget::Default, tr("Close"));
diff --git a/doomsday/client/src/ui/widgets/notificationwidget.cpp b/doomsday/client/src/ui/widgets/notificationwidget.cpp
index b86404b7d1..13494f511e 100644
--- a/doomsday/client/src/ui/widgets/notificationwidget.cpp
+++ b/doomsday/client/src/ui/widgets/notificationwidget.cpp
@@ -18,6 +18,7 @@
 
 #include "ui/widgets/notificationwidget.h"
 #include "ui/widgets/guirootwidget.h"
+#include "ui/widgets/sequentiallayout.h"
 
 #include <de/Drawable>
 #include <de/Matrix>
@@ -98,44 +99,26 @@ DENG2_PIMPL(NotificationWidget)
     {
         Rule const &gap = self.style().rules().rule("unit");
 
-        Rule const *totalWidth = 0;
-        Rule const *totalHeight = 0;
+        // The children are laid out simply in a row from right to left.
+        SequentialLayout layout(self.rule().right(), self.rule().top(), ui::Left);
 
-        WidgetList const children = self.Widget::children();
-        for(int i = 0; i < children.size(); ++i)
+        bool first = true;
+        foreach(Widget *child, self.childWidgets())
         {
-            GuiWidget &w = children[i]->as<GuiWidget>();
-
-            // The children are laid out simply in a row from right to left.
-            w.rule().setInput(Rule::Top, self.rule().top());
-            if(i > 0)
-            {
-                w.rule().setInput(Rule::Right, children[i - 1]->as<GuiWidget>().rule().left() - gap);
-                changeRef(totalWidth, *totalWidth + gap + w.rule().width());
-            }
-            else
+            GuiWidget &w = child->as<GuiWidget>();
+            if(first)
             {
-                w.rule().setInput(Rule::Right, self.rule().right());
-                totalWidth = holdRef(w.rule().width());
-            }
-
-            if(!totalHeight)
-            {
-                totalHeight = holdRef(w.rule().height());
+                layout << w;
+                first = false;
             }
             else
             {
-                changeRef(totalHeight, OperatorRule::maximum(*totalHeight, w.rule().height()));
+                layout.append(w, gap);
             }
         }
 
         // Update the total size of the notification area.
-        self.rule()
-                .setInput(Rule::Width,  *totalWidth)
-                .setInput(Rule::Height, *totalHeight);
-
-        releaseRef(totalWidth);
-        releaseRef(totalHeight);
+        self.rule().setSize(layout.width(), layout.height());
     }
 
     void show()
diff --git a/doomsday/client/src/ui/widgets/scrollareawidget.cpp b/doomsday/client/src/ui/widgets/scrollareawidget.cpp
index 17045426af..af04a1f782 100644
--- a/doomsday/client/src/ui/widgets/scrollareawidget.cpp
+++ b/doomsday/client/src/ui/widgets/scrollareawidget.cpp
@@ -185,6 +185,13 @@ void ScrollAreaWidget::setContentHeight(Rule const &height)
     d->contentRule.setInput(Rule::Height, height);
 }
 
+void ScrollAreaWidget::setContentSize(Rule const &width, Rule const &height)
+{
+    DENG2_GUARD(d);
+    setContentWidth(width);
+    setContentHeight(height);
+}
+
 void ScrollAreaWidget::setContentSize(Vector2i const &size)
 {
     DENG2_GUARD(d);
diff --git a/doomsday/client/src/ui/widgets/sequentiallayout.cpp b/doomsday/client/src/ui/widgets/sequentiallayout.cpp
index aed9b98c6c..3500493198 100644
--- a/doomsday/client/src/ui/widgets/sequentiallayout.cpp
+++ b/doomsday/client/src/ui/widgets/sequentiallayout.cpp
@@ -83,17 +83,19 @@ DENG2_PIMPL(SequentialLayout)
 
     void append(GuiWidget *widget, Rule const *spaceBefore)
     {
+        if(spaceBefore)
+        {
+            advancePos(*spaceBefore);
+        }
+
+        if(!widget) return;
+
         widgets << widget;
 
         // Override the widget's size as requested.
         if(fixedWidth)  widget->rule().setInput(Rule::Width,  *fixedWidth);
         if(fixedHeight) widget->rule().setInput(Rule::Height, *fixedHeight);
 
-        if(spaceBefore)
-        {
-            advancePos(*spaceBefore);
-        }
-
         RuleRectangle &rule = widget->rule();
 
         // Update the minor axis.