void gtk_menu_attach_to_widget ( GtkMenu* menu, GtkWidget* attach_widget, GtkMenuDetachFunc detacher )
Attaches the menu to the widget and provides a callback function
that will be invoked when the menu calls
If the menu is attached to the widget then it will be destroyed when the widget is destroyed, as if it was a child widget. An attached menu will also move between screens correctly if the widgets moves between screens.