flex上传怎么做?

如题：flex 中 要先弹出那个文件选择框，然后把filename 放到一个textinput中，再点击上传，怎么实现。

如：

<?xml version="1.0" encoding="utf-8"?>
<ns1:FTitleWindow xmlns:ns1="f8ssm.view.components.*"
xmlns:mx=" http://www.adobe.com/2006/mxml"
  width="434" height="356" layout="absolute">
 <mx:Label text="标题：" x="41" y="35" width="45"/>
 <mx:TextInput x="106" y="33" width="256"/>
 <mx:Label x="41" y="75" text="内容："/>
 <mx:TextArea x="106" y="74" width="256" height="159"/>
 <mx:Button x="182" y="275" label="提 交" width="66"/>
 <mx:Button x="288" y="275" label="取 消" click="this.close()"/>
 <mx:Label x="41" y="245" text="附件："/>
 <mx:TextInput id="filename" x="106" y="243" width="220" height="24"/>
 <mx:Button x="345" y="242" label="选择" width="52" click="fileUpload(event)"/>
 
 <mx:Script>
  <![CDATA[
   import f8ssm.view.components.FileLoad;
   import mx.controls.Alert;
   private var fileload:FileLoad = new FileLoad();
   private var file:FileReference;
   private function fileUpload(e:MouseEvent):void{
    var allTypes:Array=new Array();
    allTypes.push(new FileFilter("*","*"));
    file = new FileReference();
    file.addEventListener(Event.SELECT, onSelect);
    var boole:Boolean = file.browse(allTypes);
      }
      private function onSelect(e:Event):void{
      this.filename.text = file.name.toString();
      }
      private function onClick():void{
      
    
    
//    
 //    
      }
  ]]>
 </mx:Script>
 
</ns1:FTitleWindow>