anchor.diff:          new Icon(key: 'menu', style: _iconStyle,
               size: 24,
               type: 'navigation/menu_white')
  -          ..events.listen('gesturetap', _drawerAnimation.toggle),
  +          ..events.listen('gesturetap', _DrawerController.toggle),
           new Container(
             style: _titleStyle,
             children: [title]
  
positive.code:       drawer
      ];
  
      if (_isShowingMenu)
        children.add(new StockMenu());
  
      return new Container(key: 'StocksApp', children: children);
    }
  
negative.code: 
    Node build() {
      var drawer = new Drawer(
        controller: _DrawerController,
        level: 3,
        children: [
          new DrawerHeader(
  