<?xml version="1.0" encoding="utf-8"?>

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"

layout="vertical"

verticalAlign="middle"

backgroundColor="white">



<mx:Script>

<![CDATA[

import mx.controls.ButtonBar;



private var buttonBarXML:XML = describeType(ButtonBar);



private function buttonBar_labelFunc(item:Object):String {

var cat:String = item.category.toUpperCase();

var len:uint = buttonBarXML.factory.child(item.data).length();

return cat + " (" + len + ")";

}

]]>

</mx:Script>

<mx:Array id="arr">

<mx:Object category="Accessors" data="accessor" />

<mx:Object category="Methods" data="method" />

</mx:Array>

<mx:ButtonBar id="buttonBar"

dataProvider="{arr}"

labelFunction="buttonBar_labelFunc" />

</mx:Application>