static void
grab_notify_cb (GtkWidget *widget,
                gboolean   was_grabbed,
		gpointer   user_data)
{
  MyWidgetPrivate *private_data;

  private_data = MY_WIDGET (widget)->private;

  if (private_data->grabbed_device &&
      private_data->dialog &&
      gtk_widget_device_is_shadowed (private_data->dialog, private_data->grabbed_device)
    {
      gtk_device_grab_remove (private_data->dialog, private_data->grabbed_device);
      private_data->grabbed_device = NULL;
    }
}