Give an example of the XML defining a GTK window for a To-Do list application. The UI design should follow Gnome's design guidelines.
Here's an example of XML code defining a GTK window for a To-Do list application that follows Gnome's design guidelines:

```xml
<?xml version=1.0 encoding=UTF-8?>
<!DOCTYPE interface PUBLIC -//GNOME//DTD Gtk 3.0//EN
  http://developer.gnome.org/dtd/3.0/gtk.dtd>
<interface>
  <object class=GtkWindow id=main-window>
    <property name=title>To-Do List</property>
    <property name=default-width>600</property>
    <property name=default-height>400</property>
    <child>
      <object class=GtkBox id=main-box>
        <property name=orientation>vertical</property>
        <child>
          <object class=GtkEntry id=new-item-entry>
            <property name=hexpand>true</property>
            <property name=placeholder-text>Add a new item</property>
          </object>
        </child>
        <child>
          <object class=GtkScrolledWindow id=item-list-scroll>
            <property name=hexpand>true</property>
            <property name=vexpand>true</property>
            <child>
              <object class=GtkListBox id=item-list>
                <property name=selection-mode>none</property>
              </object>
            </child>
          </object>
        </child>
        <child>
          <object class=GtkButtonBox id=button-box>
            <property name=layout-style>spread</property>
            <property name=halign>end</property>
            <child>
              <object class=GtkButton id=add-button>
                <property name=label>Add</property>
              </object>
            </child>
            <child>
              <object class=GtkButton id=delete-button>
                <property name=label>Delete</property>
                <property name=sensitive>false</property>
              </object>
            </child>
          </object>
        </child>
      </object>
    </child>
  </object>
</interface>
```

In this example, the XML code defines a GTK window with a vertical box layout containing three child elements: an entry box for adding new items, a scrolled window containing a list box of items, and a button box containing Add and Delete buttons. The code also sets properties for various elements, such as the window title, default size, and button labels. The design follows Gnome's guidelines for spacing, alignment, and layout style.
Thanks
You're welcome! If you have any more questions about the XML code or Gnome's design guidelines, feel free to ask.
How can I run that XML to be displayed as an actual GUI desktop application using C++? Just XML isn't enough for a desktop app.