Use ActionScript to set up the data provider for Tree control
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="creationCompleteHandler(event)">
<mx:Script>
import mx.collections.ArrayCollection;
import mx.controls.List;
private function creationCompleteHandler(event:Event):void {
var array:Array = new Array({label: "CA", children: new Array(
{label: "Los Angeles"},
{label: "San Francisco"})},
{label: "MA", children: new Array(
{label: "Boston"})});
var collection:ArrayCollection = new ArrayCollection(array);
tree.dataProvider = collection;
}
</mx:Script>
<mx:Tree id="tree" labelField="label" width="200" />
</mx:Application>
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