RadioButton 分组点击

import fl.controls.RadioButton;
import fl.controls.RadioButtonGroup;
var rbg1:RadioButtonGroup = new RadioButtonGroup("group1");
var rb1:RadioButton = new RadioButton();
rbg1.addEventListener(MouseEvent.CLICK, announceGroup);
rb1.group = rbg1;
function announceGroup(e:MouseEvent):void {
    var rb:RadioButton = e.target as RadioButton;
    trace(rb.groupName);
}