gimp/menus/channels-menu.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE ui SYSTEM "gtkuimanager.dtd">

<ui>
  <popup action="channels-popup">
    <menuitem action="channels-edit-attributes" />
    <menu action="channels-color-tag-menu" name="Color Tags">
     <menuitem action="channels-color-tag-none" />
     <menuitem action="channels-color-tag-blue" />
     <menuitem action="channels-color-tag-green" />
     <menuitem action="channels-color-tag-yellow" />
     <menuitem action="channels-color-tag-orange" />
     <menuitem action="channels-color-tag-brown" />
     <menuitem action="channels-color-tag-red" />
     <menuitem action="channels-color-tag-violet" />
     <menuitem action="channels-color-tag-gray" />
    </menu>
    <separator />
    <menuitem action="channels-new" />
    <menuitem action="channels-raise" />
    <menuitem action="channels-lower" />
    <menuitem action="channels-duplicate" />
    <menuitem action="channels-delete" />
    <separator />
    <menuitem action="channels-selection-replace" />
    <menuitem action="channels-selection-add" />
    <menuitem action="channels-selection-subtract" />
    <menuitem action="channels-selection-intersect" />
    <separator />
  </popup>
</ui>