Creates a #GtkMenu and populates it with menu items and
submenus according to model.
The created menu items are connected to actions found in the
#GtkApplicationWindow to which the menu belongs - typically
by means of being attached to a widget (see gtk.menu.Menu.attachToWidget)
that is contained within the #GtkApplicationWindows widget hierarchy.
Creates a #GtkMenu and populates it with menu items and submenus according to model.
The created menu items are connected to actions found in the #GtkApplicationWindow to which the menu belongs - typically by means of being attached to a widget (see gtk.menu.Menu.attachToWidget) that is contained within the #GtkApplicationWindows widget hierarchy.
Actions can also be added using gtk.widget.Widget.insertActionGroup on the menu's attach widget or on any of its parent widgets.