Set alpha for control
<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"> <mx:Script> import mx.events.EffectEvent; private function effectEndHandler(event:EffectEvent):void { vbox.alpha = 1; } </mx:Script> <mx:Move id="moveEffect" xFrom="100" effectEnd="effectEndHandler(event)" /> <mx:VBox id="vbox" alpha=".5" creationCompleteEffect="{moveEffect}"> <mx:TextInput id="textInput1" /> <mx:TextInput id="textInput2" /> <mx:TextInput id="textInput3" /> <mx:TextInput id="textInput4" /> </mx:VBox> </mx:Application>