flex图表鼠标事件

<?xml version="1.0"?>
<!-- charts/DataPointAlert.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
	<mx:Script>
		<!--[CDATA[
			import mx.controls.Alert;
			import mx.charts.events.ChartItemEvent;
			import mx.collections.ArrayCollection;
			[Bindable]
			public var dataSet:ArrayCollection=new ArrayCollection([{Month: "Jan", Expenses: 1500}, {Month: "Feb", Expenses: 200}, {Month: "Mar", Expenses: 500}]);
			public function myHandler(e:ChartItemEvent):void
			{
				Alert.show("Chart data was clicked");
			}
		]]-->
	</mx:Script>
	<mx:Panel title="Clickable Column Chart">
		<mx:ColumnChart id="myChart"
						itemClick="myHandler(event)"
						dataProvider="{dataSet}">
			<mx:horizontalAxis>
				<mx:CategoryAxis dataProvider="{dataSet}"
								 categoryField="Month"/>
			</mx:horizontalAxis>
			<mx:series>
				<mx:ColumnSeries yField="Expenses"
								 displayName="Expenses"/>
			</mx:series>
		</mx:ColumnChart>
		<mx:Legend dataProvider="{myChart}"/>
	</mx:Panel>
</mx:Application>