[flexcoders] What does it take to detect MOUSE_MOVE?

[mossdude]

Why can't I catch mouse events with the stage?  I verified that the
stage object exists before attaching the event listener, yet the event
handler never executes.

<mx:Application 
    xmlns:mx="http://www.adobe.com/2006/mxml";
        width="1000" height="500">

        <mx:Script>
                import mx.controls.Alert;
                import flash.events.MouseEvent;

                public function go():void {
                        stage.addEventListener ( MouseEvent.MOUSE_MOVE, 
yeahbaby );
                }

                public function yeahbaby():void {
                        Alert.show ("Yeah, baby!");
                }
        </mx:Script>

        <mx:Button id="go_btn" x="10" y="10" label="Go!" width="100"
click="go()" />

</mx:Application>