Stage.focus.id doesn't work

Question

Hello,
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" applicationComplete="comp(event)" xmlns:s="library://ns.adobe.com/flex/spark">
<mx:Script>
    <![CDATA[
      public function comp(event:Event):void {
        stage.addEventListener(MouseEvent.MOUSE_UP, mouseUpHandler);
public function mouseUpHandler(event:MouseEvent):void {
  are.text=stage.focus.id;
    ]]>
  </mx:Script>
<s:VGroup paddingLeft="15" paddingTop="10">
  <s:TextInput width="400" id="inp"/>
  <s:TextArea width="400" id="are"/>
</s:VGroup>
</mx:Application>
I have a message error (InteractiveObject property) , thanks.

Answer 1

Stage.focus is too low-level, try getFocus().id