Flex中如何通过监听itemClick事件检测FlexRadioButtonGroup中RadioButton被点击的例子

让我们先来看一下Demo（

）：

下面是完整代码(或点击这里察看)：
Download: main.mxml

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="middle"
backgroundColor="white">

<mx:Script>
<![CDATA[
import mx.events.ItemClickEvent;

private function radioGroup_itemClick(evt:ItemClickEvent):void {
var now:String = new Date().toTimeString();
lbl.text = evt.label + " (" + now + ")";
}
]]>
</mx:Script>

<mx:ApplicationControlBar dock="true">
<mx:Label id="lbl" fontWeight="bold" />
</mx:ApplicationControlBar>

<mx:RadioButtonGroup id="radioGroup"
itemClick="radioGroup_itemClick(event);" />

<mx:VBox>
<mx:RadioButton id="radioButton1"
label="Red"
group="{radioGroup}" />
<mx:RadioButton id="radioButton2"
label="Orange"
group="{radioGroup}" />
<mx:RadioButton id="radioButton3"
label="Yellow"
group="{radioGroup}" />
<mx:RadioButton id="radioButton4"
label="Green"
group="{radioGroup}" />
<mx:RadioButton id="radioButton5"
label="Blue"
group="{radioGroup}" />
</mx:VBox>

</mx:Application>