如此简单的Flex拖动效果

<mx:Panel title="Select activities" layout="horizontal">
        <mx:VBox width="50%">
            <mx:Label text="Available activities"/>
            <mx:List
                id="srclist" width="100%" height="100"
                allowMultipleSelection="true"                
                dragEnabled="true"
                dropEnabled="true"
                dragMoveEnabled="true"
            />
        </mx:VBox>

        <mx:VBox width="50%">
            <mx:Label text="Activities I enjoy"/>
            <mx:List  
                id="destlist" width="100%" height="100"
                dropEnabled="true"
                dragEnabled="true"
                allowMultipleSelection="true"
                dragMoveEnabled="true"
            />
        </mx:VBox>
    </mx:Panel>