anchor.diff:    int _loadingCount = 0;
     bool _loaded = false;
   
  -//  Ranger.GroupNode _zoomControl;
     ZoomGroup _zoomControl;
     
     GameLayer();
  
positive.code:   }
  
    void _configure() {
  //    _zoomControl = new Ranger.GroupNode.basic();
      _zoomControl = new ZoomGroup.basic();
      addChild(_zoomControl, 10);
      _zoomControl.iconVisible = true;
      _zoomControl.iconScale = 50.0;
      _zoomControl.setPosition(-100.0, -100.0);
      
      //---------------------------------------------------------------
      // Create nodes.
  
negative.code:   bool onMouseDown(MouseEvent event) {
      if (event.altKey) {
        Ranger.Application app = Ranger.Application.instance;
        // Use "this" when mapping the position
        // Use "_zoomControl" when mapping the scaleCenter.
        Ranger.Vector2P nodeP = app.drawContext.mapViewToNode(_zoomControl, event.offset.x, event.offset.y);
        
        _zoomControl.scaleCenter.setFrom(nodeP.v);
        nodeP.moveToPool();
        return true;
      }
  