About hierarchical menus

To create hierarchical menus, embed XML elements within a parent XML element, as follows:

<menu>
    <menuitem label="MenuItem A" >
      <menuitem label="SubMenuItem 1-A" />
      <menuitem label="SubMenuItem 2-A" />
    </menuitem>
    <menuitem label="MenuItem B" >
      <menuitem label="SubMenuItem 1-B" />
      <menuitem label="SubMenuItem 2-B" />
    </menuitem>
</menu>

This converts the parent menu item into a pop-up menu anchor, so it does not generate events when selected.