flex linkbar使用

<?xml version="1.0"?>
<!-- controls\bar\LBarSimple.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
<mx:Script>
	<![CDATA[
		import mx.controls.Alert;
		private function show(str:String):void {
			switch(str) {
				case "监控":
				f1();
				break;
				case "管理":
				f2();
				break;
			}
		}
		
		public function f1():void {
			Alert.show("监控");
		}
		
		public function f2():void {
			Alert.show("管理");
		}
	]]>
</mx:Script>
    <mx:LinkBar borderStyle="solid"
        itemClick="show(String(event.label))">
        <mx:dataProvider>
            <mx:String>监控</mx:String>
            <mx:String>管理</mx:String>
        </mx:dataProvider>  
    </mx:LinkBar>
</mx:Application>