ActionScript 3.0 :: Add Duplicate Movieclip "box_mc" In Attached Code?

I would like the "box_mc" movieClip to remain on the stage and a duplicate created when clicked on and dragged to a new location on the stage.

Actionscript Code:
box_mc.addEventListener(MouseEvent.MOUSE_DOWN, duplicateBox);var startX:Number;var startY:Number;function duplicateBox(event:MouseEvent):void { event.target.parent.addChild(event.target); startX = event.target.x;  startY = event.target.y;  event.target.startDrag(true);}