public static void DestroyActor(Clutter.Actor actor)
 {
     GC.SuppressFinalize(actor);
     clutter_actor_destroy(actor.Handle);
 }
 public static void RemoveFromGroup(System.IntPtr group, Clutter.Actor actor)
 {
     GC.SuppressFinalize(actor);
     clutter_container_remove(group, actor.Handle);
 }