Flex中如何通过selectedButtonTextStyleName样式，设置ToggleButtonBar选中按钮文本颜色

 main.mxml

1. <?xml version="1.0" encoding="utf-8"?>
2. <mx:Application name="ToggleButtonBar_selectedButtonTextStyleName_test"
3.         xmlns:mx="http://www.adobe.com/2006/mxml"
4.         layout="vertical"
5.         verticalAlign="middle"
6.         backgroundColor="white">
7.  
8.     <mx:Style>
9.         .mySelectedButtonTextStyleName {
10.             color: haloBlue;
11.         }
12.     </mx:Style>
13.  
14.     <mx:Array id="arr">
15.         <mx:Object label="One Fish" />
16.         <mx:Object label="Two Fish" />
17.         <mx:Object label="Red Fish" />
18.         <mx:Object label="Blue Fish" />
19.     </mx:Array>
20.  
21.     <mx:ToggleButtonBar id="toggleButtonBar"
22.             selectedButtonTextStyleName="mySelectedButtonTextStyleName"
23.             dataProvider="{arr}" />
24.  
25. </mx:Application>