<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2007/08/28/detecting-the-mouse-scroll-wheel-in-a-flex-application/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
		layout="vertical"
		verticalAlign="middle"
		backgroundColor="white"
		creationComplete="init()" viewSourceURL="srcview/index.html">

	<mx:Script>
		<![CDATA[
			private function init():void {
				systemManager.addEventListener(MouseEvent.MOUSE_WHEEL, doMouseWheel);	
			}

			private function doMouseWheel(evt:MouseEvent):void {
				num += evt.delta;
			}
		]]>
	</mx:Script>
	
	<mx:Number id="num">0</mx:Number>
	
	<mx:NumberFormatter id="numberFormatter" />
	
	<mx:ApplicationControlBar dock="true">
		<mx:Label text="Click the stage and scroll mouse wheel to begin." />
	</mx:ApplicationControlBar>

	<mx:Label text="{numberFormatter.format(num)}"
			fontSize="96" />
	
</mx:Application>