gtk/demos/gtk-demo/menus.ui

<?xml version="1.0"?>
<interface>
  <menu id="appmenu">
    <section>
      <item label="_New" action="app.new" accel="&lt;Primary&gt;n"/>
      <item label="_Open" action="app.open"/>
      <item label="_Save" action="app.save" accel="&lt;Primary&gt;s"/>
      <item label="Save _As..." action="app.save-as" accel="&lt;Primary&gt;s"/>
    </section>
    <section>
      <item label="_Quit" action="app.quit" accel="&lt;Primary&gt;q"/>
    </section>
  </menu>
  <menu id="menubar">
    <submenu label="_Preferences">
      <section>
        <item label="_Prefer Dark Theme" action="app.dark"/>
        <item label="_Hide Titlebar when maximized" action="win.titlebar"/>
        <submenu label="_Color">
          <section>
            <item label="_Red" action="app.color" target="red" accel="&lt;Primary&gt;r"/>
            <item label="_Green" action="app.color" target="green" accel="&lt;Primary&gt;g"/>
            <item label="_Blue" action="app.color" target="blue" accel="&lt;Primary&gt;b"/>
          </section>
        </submenu>
        <submenu label="_Shape">
          <section>
            <item label="_Square" action="win.shape" target="square" accel="&lt;Primary&gt;s"/>
            <item label="_Rectangle" action="win.shape" target="rectangle" accel="&lt;Primary&gt;r"/>
            <item label="_Oval" action="win.shape" target="oval" accel="&lt;Primary&gt;o"/>
          </section>
        </submenu>
        <item label="_Bold" action="win.bold" accel="&lt;Primary&gt;b"/>
      </section>
    </submenu>
    <submenu label="_Help">
      <item label="_About" action="win.about" accel="&lt;Primary&gt;a"/>
    </submenu>
  </menu>
</interface>