<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
<mx:Script>
private function initApp():void {
firstList.dataProvider = treeDP;
}
</mx:Script>
<mx:XML id="treeDP">
<node label="A">
<node label="A1"/>
<node label="A2">
<node label="A3"/>
</node>
<node label="B"/>
<node label="C"/>
<node label="D"/>
</node>
</mx:XML>
<mx:Tree id="firstList" showRoot="false" labelField="@label" dragEnabled="true" dropEnabled="true" allowMultipleSelection="true" creationComplete="initApp();"/>
</mx:Application>
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