Make the popup menu work again.

sky/examples/stocks2/lib/stock_home.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import 'package:sky/editing2/input.dart';
 import 'package:sky/theme2/colors.dart' as colors;
 import 'package:sky/theme2/typography.dart' as typography;
 import 'package:sky/widgets/basic.dart';
 import 'package:sky/widgets/drawer.dart';
 import 'package:sky/widgets/drawer_header.dart';
@@ skipping 96 matching lines @@
     });
   }
 
   Drawer buildDrawer() {
     return new Drawer(
       controller: _drawerController,
       level: 3,
       children: [
         new DrawerHeader(children: [new Text('Stocks')]),
         new MenuItem(
-          key: 'Stock list',
           icon: 'action/assessment',
           children: [new Text('Stock List')]),
         new MenuItem(
-          key: 'Account Balance',
           icon: 'action/account_balance',
           children: [new Text('Account Balance')]),
-        new MenuDivider(key: 'div1'),
+        new MenuDivider(),
         new MenuItem(
-          key: 'Optimistic Menu Item',
           icon: 'action/thumb_up',
           onGestureTap: (event) => _handleStockModeChange(StockMode.optimistic),
           children: [
             new Flexible(child: new Text('Optimistic')),
-            new Radio(key: 'optimistic-radio', value: StockMode.optimistic, groupValue: _stockMode, onChanged: _handleStockModeChange)
+            new Radio(value: StockMode.optimistic, groupValue: _stockMode, onChanged: _handleStockModeChange)
           ]),
         new MenuItem(
-          key: 'Pessimistic Menu Item',
           icon: 'action/thumb_down',
           onGestureTap: (event) => _handleStockModeChange(StockMode.pessimistic),
           children: [
             new Flexible(child: new Text('Pessimistic')),
-            new Radio(key: 'pessimistic-radio', value: StockMode.pessimistic, groupValue: _stockMode, onChanged: _handleStockModeChange)
+            new Radio(value: StockMode.pessimistic, groupValue: _stockMode, onChanged: _handleStockModeChange)
           ]),
-        new MenuDivider(key: 'div2'),
+        new MenuDivider(),
         new MenuItem(
-          key: 'Settings',
           icon: 'action/settings',
           onGestureTap: (event) => _navigator.pushNamed('/settings'),
           children: [new Text('Settings')]),
         new MenuItem(
-          key: 'Help & Feedback',
           icon: 'action/help',
           children: [new Text('Help & Feedback')])
      ]
     );
   }
 
   Widget buildToolBar() {
     return new ToolBar(
         left: new IconButton(
           icon: 'navigation/menu_white',
@@ skipping 45 matching lines @@
         floatingActionButton: new FloatingActionButton(
           child: new Icon(type: 'content/add_white', size: 24)
         ),
         drawer: _drawerShowing ? buildDrawer() : null
       ),
     ];
     addMenuToOverlays(overlays);
     return new Stack(overlays);
   }
 }