Set HTMLText With Initialize event
<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" backgroundColor="#ffffff"> <mx:Script> private function initText():void { htmlLabel.htmlText = "This text <b>is bold</b>"; } </mx:Script> <mx:Label id="htmlLabel" initialize="initText()"/> </mx:Application>