循环访问RadioButtonGroup中的各个子项的值.

numRadioButtons 属性and getRadioButtonAt() 方法.
示例：

代码：

<? xml version="1.0" encoding="utf-8" ?>
<!--  http://blog.flexexamples.com/2008/06/20/looping-over-radiobutton-controls-in-a-radiobuttongroup-in-flex/  -->
< mx:Application  xmlns:mx ="http://www.adobe.com/2006/mxml"
        layout ="vertical"
        verticalAlign ="middle"
        backgroundColor ="white" >

     < mx:Script >
         <![CDATA[
            import mx.controls.Alert;

            private function showAlert():void {
                var arr:Array = [];
                var rb:RadioButton;
                var idx:int;
                var len:int = radioGroup.numRadioButtons;

                for (idx=0; idx<len; idx++) {
                    rb = radioGroup.getRadioButtonAt(idx);
                    arr.push("index:" + idx + ", label:" + rb.label);
                }
                Alert.show(arr.join("\n"), "getRadioButtonAt():");
            }
         ]]>
     </ mx:Script >

     < mx:ApplicationControlBar  dock ="true" >
         < mx:Button  label ="Click me"  click ="showAlert();"   />
     </ mx:ApplicationControlBar >

     < mx:RadioButtonGroup  id ="radioGroup"   />

     < mx:VBox >
         < mx:RadioButton  id ="radioButton1"  label ="One"   />
         < mx:RadioButton  id ="radioButton2"  label ="Two"   />
         < mx:RadioButton  id ="radioButton3"  label ="Three"   />
         < mx:RadioButton  id ="radioButton4"  label ="Four"   />
         < mx:RadioButton  id ="radioButton5"  label ="Five"   />
     </ mx:VBox >

</ mx:Application >