Fade Behaviours alpha value and duration
<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"> <mx:Fade id="fadeInstance" alphaFrom="0" alphaTo="1" duration="1000" /> <mx:Button label="Fade Button" creationCompleteEffect="{fadeInstance}" /> </mx:Application>