The created buttons are connected to actions found in the
action groups that are accessible from the parent widget.
This includes the gtk.application_window.ApplicationWindow to which the popover
belongs. Actions can also be added using gtk.widget.Widget.insertActionGroup
on the parent widget or on any of its parent widgets.
Creates a gtk.popover_menu.PopoverMenu and populates it according to model.
The created buttons are connected to actions found in the action groups that are accessible from the parent widget. This includes the gtk.application_window.ApplicationWindow to which the popover belongs. Actions can also be added using gtk.widget.Widget.insertActionGroup on the parent widget or on any of its parent widgets.