Description The GtkMenuItem widget and the derived widgets are the only valid childs for menus. Their function is to correctly handle highlighting, alignment, events and submenus. As it derives from GtkBin it can hold any valid child widget, altough only a few are really useful. GtkMenuItem as GtkBuildable The GtkMenuItem implementation of the GtkBuildable interface supports adding a submenu by specifying "submenu" as the "type" attribute of a <child> element.