<mx:Panel 
      title="{message}" horizontalAlign="center"
      paddingTop="10" paddingBottom="10" paddingLeft="10" paddingRight="10" 
    >
      <mx:Label id="field" width="180" fontWeight="bold" fontSize="24"/>
      <mx:Button label="{button}" click="handler(event);" />
    </mx:Panel>
  </mx:Application>