code: func (v *ApplicationWindow) native() *C.GtkApplicationWindow {
  	if v == nil || v.Window.GObject == nil { // v.Window is necessary because v.GObject would be ambiguous
  		return nil
  	}
  	p := unsafe.Pointer(v.Window.GObject)
  	return C.toGtkApplicationWindow(p)
  }
docs: // native returns a pointer to the underlying GtkApplicationWindow.