Creates a gtk.MenuItem as an exact copy of an existing menu item in a gio.MenuModel
item_index must be valid (ie: be sure to call Menu.modelGetNItems first).
a gio.MenuModel
the index of an item in model
a new gtk.MenuItem
ConstructionException GTK+ fails to create the object.
2.34
Creates a gtk.MenuItem as an exact copy of an existing menu item in a gio.MenuModel
item_index must be valid (ie: be sure to call Menu.modelGetNItems first).