 		private const _d2dTaskOwner:Dictionary2D = new Dictionary2D(false, true); // task cannot use weak pointer because it may be a function
 		private const _dBusyTraversal:Dictionary = new Dictionary(true); // ILinkableObject -> Boolean
 		private const _aBusyTraversal:Array = [];
-		private var _unbusyTriggerInitialized:Boolean = false;
 		private const _dUnbusyTriggerCounts:Dictionary = new Dictionary(true); // ILinkableObject -> int
 		private const _dUnbusyStackTraces:Dictionary = new Dictionary(true); // ILinkableObject -> String
 		

					cc.triggerCallbacks();
				}
			} while (owner);
		}
		
		/**

		/**
		 * Called the frame after an owner's last busy task is unassigned.
		 * Triggers callbacks if they have not been triggered since then.
		 */
		private function unbusyTrigger(stopTime:int):Number
		{
			var owner:*;
			do {
				if (getTimer() > stopTime)
					return 0;
				
				owner = null;
				for (owner in _dUnbusyTriggerCounts)
				{
