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DragManager showFeedback(DragManager LINK)

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"     backgroundColor="white">     <mx:Script>                  import mx.core.DragSource;         import mx.managers.DragManager;         import mx.events.*;         import mx.controls.Button;         import mx.collections.ArrayCollection;         [Bindable]         public var myAC:ArrayCollection = new ArrayCollection([             {name:"A", price:1.5},             {name:"B", price:1.8}]);                  public function initiateDrag(event:MouseEvent):void         {             var dragInitiator:Button=Button(event.currentTarget);             var ds:DragSource = new DragSource();             ds.addData(dragInitiator.label,"name");             DragManager.doDrag(dragInitiator, ds, event);         }         public function handleDragEnter(event:DragEvent):void         {             DragManager.acceptDragDrop(event.currentTarget as VBox);         }         public function handleDragOver(event:DragEvent):void         {             if (event.shiftKey)             {                 DragManager.showFeedback(DragManager.LINK);                 event.currentTarget.setStyle('borderColor', 'green');             }         }         public function handleDrop(event:DragEvent):void         {             var newButton:Button = new Button();             newButton.label = event.dragSource.dataForFormat("name") as String;             droppableArea.addChild(newButton);             droppableArea.setStyle('borderColor','black');             if(event.action == DragManager.MOVE)                 buttonPanel.removeChild(event.dragInitiator as Button);         }         public function handleDragExit(event:DragEvent):void         {             droppableArea.setStyle('borderColor','black');         }            </mx:Script>     <mx:VBox id="buttonPanel">         <mx:Label text="Drag the buttons into the box to copy them in" />         <mx:Button label="A" mouseMove="initiateDrag(event)" />     </mx:VBox>     <mx:VBox id="droppableArea"               borderColor="black"               dragEnter="handleDragEnter(event)"               dragOver="handleDragOver(event)"              dragDrop="handleDrop(event)"               dragExit="handleDragExit(event)"              width="94"               height="76"               backgroundColor="#D7FE2E"               borderStyle="solid" /> </mx:Application>