Use dataTipFormatFunction to format the data tip text
<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"> <mx:Script> private function myDataTipFunc(val:String):String { return "Current value: " + String(val); } </mx:Script> <mx:HSlider height="80" dataTipFormatFunction="myDataTipFunc" /> </mx:Application>