public function add(handlerType:Class):InstanceHandlerCollection {
			var handler:* = instanceClass(handlerType);
			var foundType:Boolean = false;

			if (handler is BeforeInstanceHandler) {
				beforeHandlers.push(handler);
				foundType = true;
			}

			if (handler is AfterInstanceHandler) {
				afterHandlers.push(handler);
				foundType = true;
			}

			if (!foundType)
				throw new NotAnInstanceHandlerError(handlerType);

			return this;
		}