Use this[control label] to reference controls declared

           

<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Script>
    public function changeLabel(s:String):void {
        s = "myButton" + s;
        this[s].setStyle("fontStyle","italic");
        this[s].setStyle("fontSize","18");
    }
  </mx:Script>
    <mx:Button id="myButton1" click="changeLabel('2')" label="Change Other Button's Styles" />
    <mx:Button id="myButton2" click="changeLabel('1')" label="Change Other Button's Styles" />
</mx:Application>

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Use this[control label] to reference controls declared : Spark component « Components « Flex

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