rollOverEffect and rollOutEffect
<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"> <mx:Resize id="resizeBig" widthFrom="120" widthTo="200" /> <mx:Resize id="resizeSmall" widthFrom="200" widthTo="120" /> <mx:Image width="120" source="@Embed('logo.jpg')" rollOverEffect="{resizeBig}" rollOutEffect="{resizeSmall}" /> </mx:Application>