anchor.diff:      Ranger.Size<double> size = contentSize;
       double hWdith = size.width / 2.0;
       double hHeight = size.height / 2.0;
  +
  +    GameManager gm = GameManager.instance;
  +
  +    addChild(gm.spikeShip, 10);
  +    gm.spikeShip.configure(this);
  +    gm.spikeShip.uniformScale = gm.spikeShip.baseScale = 25.0;
  +    gm.spikeShip.visible = false;
  +
  +    Ranger.Application.instance.eventBus.on(ZoomGroup).listen(
  +    (ZoomGroup zg) {
  +      gm.spikeShip.uniformScale = gm.spikeShip.baseScale * zg.currentScale;
  +    });
   
       //---------------------------------------------------------------
       // Create nodes.
  
positive.code:     _messageText.uniformScale = 5.0;
      addChild(_messageText, 10, 111);
      
      _help = new Ranger.GroupNode.basic();
      _help.visible = false;
      _help.setPosition(-900.0, -250.0);
  
negative.code:     Ranger.Size size = contentSize;
      double minS = min(size.width, size.height) / 2.0;
      centerZoneRadius = minS - (minS * 0.5);
  
      autoScroll = new SpongyAutoScroll.withRadius(centerZoneRadius);
  //    autoScroll = new TightAutoScroll.withRadius(centerZoneRadius);
      addChild(autoScroll.node, 12, 930);
    }
  
    void toggleScrollZoneVisibility() {
      autoScroll.zone.iconsVisible = !autoScroll.zone.iconsVisible;
      
      if (autoScroll.zone.iconsVisible)
        _messageText.text = "Scroll zone visual turned on";
      else
        _messageText.text = "Scroll zone visual turned off";
  