public override void VisitConcreteElementB( ConcreteElementB theElement)
		{
			Debug.Log ("ConcreteVicitor1.VisitConcreteElementB()");
			theElement.OperationB();
		}
		public override void VisitConcreteElement( ConcreteElementB theElement)
		{
			Debug.Log ("ConcreteVicitor2.VisitConcreteElement(B)");
		}
		public abstract void VisitConcreteElementB( ConcreteElementB theElement);