Adding color to application background

I was running through a simple tutorial for loading XML into Flex and displaying it in a thumbnail when I got the following error:

appBgCol.mxml

<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
	<mx:Script>
		<![CDATA[
		import mx.events.ColorPickerEvent;
		public function changeEvt(event:ColorPickerEvent):void
		{
			var clrs:Array = new Array();
			/*
			IF YOU WANT GRADIENT COLORS FOR BACKGROUND
			clrs.push(0x990000);
			clrs.push(myCP.selectedColor);
			this.setStyle("backgroundGradientColors",clrs);
			*/
			this.setStyle("backgroundColor",myCP.selectedColor);
		}
		]]>
	</mx:Script>
	<mx: Panel width="80%" height="80%" >
		<mx:ColorPicker id="myCP" change="changeEvt(event);"/>
	</mx: Panel>
</mx:Application>