List 拖动数据 for Flex

在Flex中List的数据拖动只需要设置以下几个属性就行了．
dragEnabled="true"　dragMoveEnabled="true"　dropEnabled="true"
例：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="init()">
    <mx:Script>   
          <![CDATA[
              import mx.controls.listClasses.ListItemRenderer;
            import mx.collections.ArrayCollection; 
            import comm.*;  
            import mx.controls.Alert;
            import mx.events.SliderEvent;
            
            [Bindable]   
            private var carArray : ArrayCollection = new ArrayCollection(); 
              
            private var db:XML= 
                <object>        
                    <car>
                        <Name>wubiyu</Name>
                        <Available>true</Available>
                    </car>
                    <car>
                        <Name>wubiyu1</Name>
                        <Available>true</Available>
                    </car>
                    <car>
                        <Name>wubiyu2</Name>
                        <Available>true</Available>
                    </car>
                    <car>
                        <Name>wubiyu3</Name>
                        <Available>true</Available>
                    </car>
                </object>
               
            private function init():void 
            {                      
                var car : CarVO = new CarVO();   
                car.Name = "Ford";                   
                car.Available = true;   
                carArray.addItem(car);   
                   
                car = new CarVO();   
                car.Name = "Benz";   
                car.Available = true;   
                carArray.addItem(car);   
                   
                car = new CarVO();   
                car.Name = "BMW";   
                car.Available = true;   
                carArray.addItem(car); 
                //List1.dataProvider = ['wubiyu1','wubiyu2','wubiyu3','wubiyu4','wubiyu5'];
                //List2.dataProvider = [];
              
                
                
            } 
            
            private function btn(e:Event):void
            {
                var ar:ArrayCollection = List2.dataProvider as ArrayCollection;       
                for(var i:int =0;i<ar.length;i++)
                {
                    Alert.show(ar.getItemAt(i).Name);                    
                }
            }  
            
            private function changeHandler(event:Event):void
            {
                 //List1.dataProvider
            }
            
            private function List2_Change(e:Event):void
            {
                Alert.show("dddd");
            }

  
        ]]>
   </mx:Script>   
  <mx:List x="10" y="0" dragEnabled="true" id="List1" allowMultipleSelection="true" 
      dropEnabled="true" dragMoveEnabled="true" width="200" dataProvider="{db.children()}" labelField="Name"></mx:List>
  <mx:List x="218" y="0" dragEnabled="true" id="List2" dropEnabled="true" 
      dragMoveEnabled="true" allowMultipleSelection="true" change="List2_Change(event)" 
      width="200" labelField="Name"></mx:List>
  <mx:Button x="156" y="177" label="Button" click="btn(event)"/>
</mx:Application>