Flex 遍历(重置)表单

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
 <mx:Script>
  <![CDATA[
   private function resetForm():void
   {
     var instanceInfo:XML=describeType(this);//通过反射机制取出当前MXML中的信息   
     var properties:XMLList =instanceInfo..accessor.(@type=="mx.controls::TextInput")      
     for each(var propertyInfo:XML in properties){     
       var propertyName:String =propertyInfo.@name;//此处取出的为control的id     
       TextInput(this[propertyName]).text="";  
     }
   }
  ]]>
 </mx:Script>
 <mx:Panel title="用户注册信息" width="359" height="303" x="24.5" y="37" fontSize="12">
  <mx:Form id="form" width="100%" height="100%" horizontalGap="0">
   <mx:FormHeading label="用户资料" width="100%"/>
   <mx:FormItem label="用户名：" width="100%" required="true">
    <mx:TextInput width="100%" id="user_txt"/>   
   </mx:FormItem>
   <mx:FormItem label="密码：" width="100%" required="true">
    <mx:TextInput width="100%" displayAsPassword="true" id="pass_txt"/>   
   </mx:FormItem>
   <mx:FormItem label="性别：" width="100%" direction="horizontal">
    <mx:RadioButton groupName="isMale" label="男" /> <mx:RadioButton groupName="isMale" label="女" />
   </mx:FormItem>
   <mx:FormItem label="邮箱：" width="100%">
    <mx:TextInput width="100%" id="email_txt"/>   
   </mx:FormItem>
   <mx:FormItem label="电话：" width="100%">
    <mx:TextInput width="100%" id="phone_txt"/>   
   </mx:FormItem>
   <mx:FormItem label="出生年月：" width="100%">
    <mx:TextInput width="100%" id="birth_txt"/>   
   </mx:FormItem>
  </mx:Form>
  <mx:ControlBar height="32" paddingBottom="0" paddingTop="0" horizontalAlign="center">
   <mx:Button id="btnSubmit" label="确定"/>
   <mx:Button id="btnReset" label="重置" click="resetForm();"/><!--flex里没有重置按钮-->
  </mx:ControlBar>
 </mx:Panel>
 
 <mx:StringValidator source="{user_txt}" property="text" minLength="6" maxLength="12" tooShortError="用户名太短了" trigger="{btnSubmit}" triggerEvent="click"/>
 <mx:StringValidator source="{pass_txt}" property="text" minLength="6" maxLength="12" trigger="{btnSubmit}" triggerEvent="click"/>
    <mx:PhoneNumberValidator source="{phone_txt}" property="text" trigger="{btnSubmit}" triggerEvent="click"/>
    <mx:DateValidator source="{birth_txt}" property="text" trigger="{btnSubmit}" triggerEvent="click"/>
    <mx:EmailValidator source="{email_txt}" property="text" trigger="{btnSubmit}" triggerEvent="click"/>
 
</mx:Application>