ReferenceError: Error #1069: 在 spark.components.RadioButtonGroup 上找不到属性 label，且没有默认值

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1、错误描述

ReferenceError: Error #1069: 在 spark.components.RadioButtonGroup 上找不到属性 label，且没有默认值。at Chart/radiogroup_itemClickHandler()[E:\Flash Builder\Map\src\Chart.mxml:49]at Chart/__radiogroup_itemClick()[E:\Flash Builder\Map\src\Chart.mxml:58]at flash.events::EventDispatcher/dispatchEventFunction()at flash.events::EventDispatcher/dispatchEvent()at spark.components::RadioButton/buttonReleased()[E:\dev\4.0.0\frameworks\projects\spark\src\spark\components\RadioButton.as:554]at spark.components.supportClasses::ButtonBase/mouseEventHandler()[E:\dev\4.0.0\frameworks\projects\spark\src\spark\components\supportClasses\ButtonBase.as:1054]

2、错误原因

protected function radiogroup_itemClickHandler(event:ItemClickEvent):void{if(event.currentTarget.label=="周"){Alert.show("OK!");}}

<fx:Declarations><s:RadioButtonGroup id="radiogroup" itemClick="radiogroup_itemClickHandler(event)"/></fx:Declarations>

3、解决办法

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