setMenuModel
Sets the GMenuModel
from which the popup will be constructed.
If @menu_model is null, the button is disabled.
A class@Gtk.Popover will be created from the menu model with ctor@Gtk.PopoverMenu.new_from_model. Actions will be connected as documented for this function.
If property@Gtk.MenuButton:popover is already set, it will be dissociated from the @menu_button, and the property is set to null.
Parameters
menuModel
a GMenuModel
, or null to unset and disable the button