import mx.controls.Alert;
import mx.events.*;
import mx.controls.Menu;
public var menuItems:Object = [{label:'One'},{label:'Two'},{label:'Three'}];
public var thisMenu:Menu = Menu.createMenu(null,menuItems,false);
public function handleItemClick(event:MenuEvent):void{
menuBtn.label = event.label;
}
creationComplete="thisMenu.addEventListener('itemClick',handleItemClick);"
popUp="{thisMenu}" />