/// <summary>
/// Delinks the object from the group in the EntityManager
/// </summary>
/// <param name="entity"></param>
/// <param name="part"></param>
/// <returns></returns>
public bool DeLinkPartFromEntity(ISceneEntity entity, ISceneChildEntity part)
{
//Remove the entity so that we can rebuild
RemoveEntity(entity);
bool RetVal = entity.RemoveChild(part);
AddEntity(entity, false);
//Now that everything is linked, destroy the undo states because it will fry the object otherwise
entity.ClearUndoState();
return RetVal;
}