Stage property of Application and all its component

Sorry it is a little bit about flex but I have nowhere to ask. so.

<?xml version="1.0"?>
<mx:Application xmlns:mx=""

            public function initApp():void
                txt.text += txt.stage;
                txt.text += stage;
                //result is nullnull
<mx:Text id="txt"/>

not only the components added on Application and all kind of DisplayObject added in a UIComponent cannot access their stage property. which make me cannot use KeyboardEvent.

Please help please :frowning: