设置RadioButton控件的背景色.

RadioButton控件的opaqueBackground样式.
示例：

代码：

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/06/18/setting-an-opaque-background-on-a-radiobutton-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:ApplicationControlBar dock="true">
        <mx:Form styleName="plain">
            <mx:FormItem label="opaqueBackground:">
                <mx:ColorPicker id="colorPicker" />
            </mx:FormItem>
        </mx:Form>
    </mx:ApplicationControlBar>

    <mx:RadioButton id="radioButton"
            label="The quick brown fox jumped over the lazy dog"
            opaqueBackground="{colorPicker.selectedColor}" />

</mx:Application>

也可以通过AS设置：
<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/06/18/setting-an-opaque-background-on-a-radiobutton-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

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

            private function colorPicker_change(evt:ColorPickerEvent):void {
                radioButton.opaqueBackground = evt.color;
            }
        ]]>
    </mx:Script>

    <mx:ApplicationControlBar dock="true">
        <mx:Form styleName="plain">
            <mx:FormItem label="opaqueBackground:">
                <mx:ColorPicker id="colorPicker"
                        change="colorPicker_change(event);" />
            </mx:FormItem>
        </mx:Form>
    </mx:ApplicationControlBar>

    <mx:RadioButton id="radioButton"
            label="The quick brown fox jumped over the lazy dog" />

</mx:Application>

来源：https://www.cnblogs.com/xxcainiao/archive/2008/07/04/1235811.html