partial void DeleteDoor(Door instance);
 partial void UpdateDoor(Door instance);
		private void detach_Doors(Door entity)
		{
			this.SendPropertyChanging();
			entity.Zone = null;
		}
 partial void InsertDoor(Door instance);
		private void attach_Doors(Door entity)
		{
			this.SendPropertyChanging();
			entity.Zone = this;
		}