<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical">

<mx:MenuBar labelField="@label" itemClick="handleMenuClick(event)">
 <mx:XMLList>
  <menuitem label="File">
   <menuitem label="New"/>
   <menuitem label="Open"/>
   <menuitem label="Close" enabled="false"/>
  </menuitem>
  <menuitem label="Edit"/>
  <menuitem label="Source"/>
  <menuitem label="View">
   <menuitem label="50%"  type="radio" groupName="one"/>
   <menuitem label="100%" type="radio" groupName="one" selected="true"/>
   <menuitem label="150%" type="radio" groupName="one"/>
  </menuitem>
 </mx:XMLList>
</mx:MenuBar>

<mx:Label id="disp0_lbl"/>

<mx:Script>
<![CDATA[
 import mx.events.MenuEvent;
 private function handleMenuClick(evt:MenuEvent):void {
  this.disp0_lbl.text = evt.item.@label + " was selected";
 }
]]>
</mx:Script>
</mx:Application>