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Enable and Disable Drag Operations

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="horizontal" creationComplete="creationHandler();">     <mx:Script>                      import mx.events.DragEvent;             import mx.collections.ArrayCollection;             [Bindable]             public var isEnabled:Boolean = true;             private function creationHandler():void {                 list1.dataProvider = new ArrayCollection(['A', 'B', 'C']);                 list2.dataProvider = new ArrayCollection(['D', 'E', 'F']);             }             private function dragEnterHandler( evt:DragEvent ):void {                 evt.target.dropEnabled = ( evt.target != evt.dragInitiator );             }            </mx:Script>     <mx:VBox width="100%" height="100%">         <mx:List id="list1" width="200" height="200" dragEnabled="{isEnabled}" dragMoveEnabled="true"                 dragEnter="dragEnterHandler(event);"/>         <mx:List id="list2" width="200" height="200" dragEnabled="{isEnabled}"                 dragMoveEnabled="true" dragEnter="dragEnterHandler(event);"/>     </mx:VBox> </mx:Application>