gtk/application_window.go
func ApplicationWindowNew(app *Application) (*ApplicationWindow, error) {
	c := C.gtk_application_window_new(app.native())
	if c == nil {
		return nil, nilPtrErr
	}
	return wrapApplicationWindow(glib.Take(unsafe.Pointer(c))), nil
}
func ApplicationWindowNew(app *Application) (*ApplicationWindow, error) {
	c := C.gtk_application_window_new(app.native())
	if c == nil {
		return nil, nilPtrErr
	}
	return wrapApplicationWindow(glib.Take(unsafe.Pointer(c))), nil
}
// ApplicationWindowNew is a wrapper around gtk_application_window_new().