Please check the code:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="absolute" backgroundGradientAlphas="[1.0, 1.0]"
backgroundGradientColors="[#000033, #000033]">
<mx:Script>
<![CDATA[
[Bindable]
private var setData:Array = [
{label:"Menu", type:"normal", children:[
{label: "A", type:"radio", groupName: "S1"},
{label: "B", type:"radio", groupName: "S1", toggled:true},
{label: "C", type:"check",toggled:true }]}];
]]>
</mx:Script>
<mx:Style>
.menuStyle {
iconColor: #ffff00;
background-color: #000033;
textSelectedColor: #000000;
color: #cccc00;
}
</mx:Style>
<mx:MenuBar dataProvider="{setData}" menuStyleName="menuStyle"
></mx:MenuBar>
</mx:Application>