ENTER_FRAME does not fire off display list

[brettPeriscopic]

Shape (& Sprite) instances do not fire Event.ENTER_FRAME events when not added to the display list.
When targeting Flash they do. Creating un-displayed instances that fire these events specifically useful
for most tweening engines. Test code:

package ;

import flash.display.Sprite;
import flash.display.Shape;
import flash.Lib;
import flash.events.Event;

class Main extends Sprite{

 public static function main() {
        Lib.current.stage.addChild(new Main());
 }

 private var _ticker:Shape;

 public function new(){
  super();
  _ticker = new Shape();
  _ticker.addEventListener(Event.ENTER_FRAME,handleFrame);
  //In Jeash you must add _ticker to display list to receive Event.ENTER_FRAME
  //while in Flash you do not
  //addChild(_ticker);
 }
 private function handleFrame(e:Event):Void{
  trace("handleFrame");
  _ticker.removeEventListener(Event.ENTER_FRAME,handleFrame);
 }
}