flex带下拉图片的combobox

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
 <!-- 组合框默认以label作为标签字段，data作为值字段 --> 
 <mx:Array id="comboData1">
  <mx:Object label="男" data="M" icon="@Embed(source='images/nan.gif')"/>
  <mx:Object label="女" data="FM" icon="@Embed(source='images/nv.gif')"/>
 </mx:Array>
 
 <mx:Script>
  <![CDATA[
   //下拉框菜单项包含图标
   private function init():void{
    combo1.dropdown.iconField = "icon";
   }
            
   private function comboChange():void{
    msg1.text = combo1.value.toString();
   }
&nbsp;  ]]>
 </mx:Script>
 
 <mx:ComboBox id="combo1" x="10" y="10" width="150" fontSize="12"
  prompt="请选择..."
  labelField="label"
  dataProvider="{comboData1}"
  alternatingItemColors="['#EEEEEE', '#FFFFFF']"
  textIndent="5"
  creationComplete="init()"
  change="comboChange()"/>
 
</mx:Application>