Can a glow filter be applied to a transparent object?

Hi guys, once again...

I have this green rectangle, with the following properties:

  targetc.width = 142;

          targetc.height = 144;

          targetc.x = 273;

          targetc.y = 218;

          targetc.alpha = 1000;

          targetc.antiAliasType = AntiAliasType.ADVANCED;

and I also have the letter C which is glowing and needs to be placed into the rectangle:

function dragC(event:MouseEvent):void {

          stage.removeEventListener(Event.ENTER_FRAME, stage_onEnterFrame);

    var item:MovieClip=letritaC(event.target);

    item.startDrag();

    var topPos:uint=this.numChildren-1;

    this.setChildIndex(item, topPos);

}

function cRelease(event:MouseEvent):void {

          var item:MovieClip=letritaC(event.target);

    item.stopDrag();      

    if (targetc.hitTestPoint(item.x,item.y)) {

        item.x=targetc.x;

        item.y=targetc.y;

    } else {

       item.x=273;

       item.y=(stage.stageHeight - 100);

    }

}

Now, as per the alpha property (if I am right), the rectangle is not visible in the screen due to its transparency... how can I make it glow, seeing only the glow, so I know where I have to put the letter C?

Thanks so much!