horizontalCenter and horizontalAlign
<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"> <mx:Panel y="10" width="250" height="200" layout="vertical" id="textPanel" title="Design Mode" horizontalCenter="0" horizontalAlign="center" verticalAlign="middle"> <mx:Label text="{labelInput.text}" id="daLabel"/> <mx:Button label="Glow!" mouseDownEffect="Glow"/> <mx:TextInput id="labelInput"/> </mx:Panel> </mx:Application>