A base class for menu widgets.
GObject `-- GtkObject `-- GtkWidget `-- GtkContainer `-- GtkMenuShell
GtkMenu, GtkMenuBar
activate_item() append() cancel() deactivate() deselect() insert() prepend() select_first() select_item()
"activate-current" "cancel" "cycle-focus" "deactivate" "move-current" "selection-done"