anchor.diff:  import 'package:sky/framework/components/menu_item.dart';
   import 'package:sky/framework/components/modal_overlay.dart';
   import 'package:sky/framework/components/popup_menu.dart';
  +import 'package:sky/framework/components/radio.dart';
   import 'package:sky/framework/components/scaffold.dart';
   import 'package:sky/framework/fn.dart';
   import 'package:sky/framework/theme/typography.dart' as typography;
  
positive.code:     });
    }
  
    Drawer buildDrawer() {
      return new Drawer(
        controller: _drawerController,
  
negative.code:     if (_menuController == null)
        return;
      overlays.add(new ModalOverlay(
        children: [new StockMenu(
          controller: _menuController,
          autorefresh: _autorefresh,
          onAutorefreshChanged: _handleAutorefreshChanged
        )],
        onDismiss: _handleMenuHide));
    }
  
  