Sets the gio.menu_model.MenuModel from which the popup will be constructed.
If menu_model is null, the button is disabled.
A gtk.popover.Popover will be created from the menu model with gtk.popover_menu.PopoverMenu.newFromModel. Actions will be connected as documented for this function.
If gtk.menu_button.MenuButton.Popover is already set, it will be dissociated from the menu_button, and the property is set to null.
a gio.menu_model.MenuModel, or null to unset and disable the button
Sets the gio.menu_model.MenuModel from which the popup will be constructed.
If menu_model is null, the button is disabled.
A gtk.popover.Popover will be created from the menu model with gtk.popover_menu.PopoverMenu.newFromModel. Actions will be connected as documented for this function.
If gtk.menu_button.MenuButton.Popover is already set, it will be dissociated from the menu_button, and the property is set to null.