Creating a radio button item renderer on a Spark List control in Flex 4

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2010/05/20/creating-a-radio-button-item-renderer-on-a-spark-list-control-in-flex-4/ -->
<s:Application name="Spark_List_itemRenderer_RadioButton_test"
        xmlns:fx="http://ns.adobe.com/mxml/2009" 
        xmlns:s="library://ns.adobe.com/flex/spark" 
        xmlns:mx="library://ns.adobe.com/flex/mx">
    <s:controlBarContent>
        <s:Label text="selected RadioButton: {dgr1.selection.label}" />
    </s:controlBarContent>
 
    <fx:Declarations>
        <s:RadioButtonGroup id="dgr1" selectedValue="Three" />
    </fx:Declarations>
 
    <s:List id="lst"
            itemRenderer="skins.RadioButtonItemRen"
            width="100"
            horizontalCenter="0" verticalCenter="0">
        <s:layout>
            <s:VerticalLayout gap="0"
                    horizontalAlign="contentJustify"
                    requestedRowCount="6" />
        </s:layout>
        <s:dataProvider>
            <s:ArrayList>
                <fx:Object val="One" gr="{dgr1}" />
                <fx:Object val="Two" gr="{dgr1}" />
                <fx:Object val="Three" gr="{dgr1}" />
                <fx:Object val="Four" gr="{dgr1}" />
                <fx:Object val="Five" gr="{dgr1}" />
                <fx:Object val="Six" gr="{dgr1}" />
                <fx:Object val="Seven" gr="{dgr1}" />
                <fx:Object val="Eight" gr="{dgr1}" />
                <fx:Object val="Nine" gr="{dgr1}" />
            </s:ArrayList>
        </s:dataProvider>
    </s:List>
 
</s:Application>

And the custom Spark List item renderer, skins/RadioButtonItemRen.mxml, is as follows:

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2010/05/20/creating-a-radio-button-item-renderer-on-a-spark-list-control-in-flex-4/ -->
<s:ItemRenderer name="RadioButtonItemRen"
        xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark" 
        autoDrawBackground="false"
        dataChange="itemrenderer1_dataChangeHandler(event);">
 
    <fx:Script>
        <![CDATA[
            protected function itemrenderer1_dataChangeHandler(evt:Event):void {
                rdBtn.label = data.val;
                rdBtn.value = data.val;
                rdBtn.group = data.gr;
            }
        ]]>
    </fx:Script>
 
    <s:RadioButton id="rdBtn"
            left="3" right="3" top="5" bottom="5" />
 
</s:ItemRenderer>

转载：http://blog.flexexamples.com/2010/05/20/creating-a-radio-button-item-renderer-on-a-spark-list-control-in-flex-4/