重写ToggleButtonBar,取消默认选中状态

package {
import mx.controls.Button;
import mx.controls.ToggleButtonBar;
public class CustomToggleButtonBar extends ToggleButtonBar
{
public function CustomToggleButtonBar() {
super();
}
private var dataReset:Boolean = false;
override public function set
dataProvider(value:Object):void {
super.dataProvider = value;
this.dataReset = true;
}
override protected function
updateDisplayList(unscaledWidth:Number,
unscaledHeight:Number):void {
super.updateDisplayList(unscaledWidth,unscaledHeight);
if(this.dataReset) {
if(selectedIndex != -1) {
var child:Button;
child = Button(getChildAt(selectedIndex));
if(child) {
child.selected = false;
this.dataReset = false;
}
}
}
}
}
}

使用方法，代码如下：

<mx:Application
xmlns:mx="http://www.adobe.com/2006/mxml"
xmlns:local="*"
layout="vertical"
initialize="initApp(event)">
<local:CustomToggleButtonBar id="toggle" selectedIndex="-1"
dataProvider="{dataProvider}" itemClick="setMode(event)"/>