FLEX实践：在程序中遍历FORMITEM

<mx:Form>
  <mx:FormItem>
     <mx:TextInput/>
  </mx:FormItem>
  <mx:FormItem>
      <mx:TextArea/>
  </mx:FormItem>
  <mx:FormItem>
      <mx:CheckBox/>
  </mx:FormItem>  
  <mx:FormItem>
      <mx:DateField/>
  </mx:FormItem>
</mx:Form>
 
现在我要通过一段代码将FORMITEM中的所有控件的数据清空。
 
以下是实现代码
 
      private function clearRow():void{
             var formItems:Array=lookupValueForm.getChildren();
             for each(var formitem:* in formItems){
              if(formitem is FormItem){
               for each(var it:* in formitem.getChildren()){
                    if(it is mx.controls.TextInput|| it is mx.controls.TextArea){
                    it.text="";
                   } else if(it is mx.controls.CheckBox){
                    it.selected=false;
                   }else if(it is mx.controls.DateField){
                    it.selectedDate=null;
                   }
                 }
              }
              
             }
           }