RadioButtonGroup可以对单选框组件RadioButton进行分组，多个RadioButton通过属性groupName指向相同的RadioButtonGroup为一组。

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"  fontFamily="微软雅黑"
			   xmlns:s="library://ns.adobe.com/flex/spark" 
			   xmlns:mx="library://ns.adobe.com/flex/mx">
	<fx:Script>
		<![CDATA[
			import mx.controls.Alert;
			import mx.events.ItemClickEvent;
			
			protected function showMessage(event:ItemClickEvent):void
			{
				Alert.show(sex.selectedValue.toString());
			}
			
		]]>
	</fx:Script>
	<fx:Declarations>
		<s:RadioButtonGroup id="sex" itemClick="showMessage(event)"/>
	</fx:Declarations>
	<s:HGroup horizontalCenter="0" verticalCenter="0">
		<s:RadioButton value="1" label="男" groupName="sex"/>
		<s:RadioButton value="0" label="女" groupName="sex"/>
	</s:HGroup>
</s:Application>