Add a new item to the settings page to show off the switch widget.

sky/sdk/example/stocks/lib/main.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/theme/colors.dart' as colors;
 import 'package:sky/widgets/basic.dart';
 import 'package:sky/widgets/navigator.dart';
 import 'package:sky/widgets/theme.dart';
 import 'package:sky/widgets/widget.dart';
 
 import 'stock_data.dart';
 import 'stock_home.dart';
 import 'stock_settings.dart';
 import 'stock_types.dart';
 
 class StocksApp extends App {
 
   NavigationState _navigationState;
   StocksApp() {
     _navigationState = new NavigationState([
       new Route(
         name: '/', 
-        builder: (navigator, route) => new StockHome(navigator, _stocks, stockMode, modeUpdater)
+        builder: (navigator, route) => new StockHome(navigator, _stocks, optimismSetting, modeUpdater)
       ),
       new Route(
         name: '/settings',
-        builder: (navigator, route) => new StockSettings(navigator, stockMode, settingsUpdater)
+        builder: (navigator, route) => new StockSettings(navigator, optimismSetting, backupSetting, settingsUpdater)
       ),
     ]);
   }
 
   void onBack() {
     setState(() {
       _navigationState.pop();
     });
     // TODO(jackson): Need a way to invoke default back behavior here
   }
 
-  StockMode stockMode = StockMode.optimistic;
-  void modeUpdater(StockMode value) {
+  StockMode optimismSetting = StockMode.optimistic;
+  BackupMode backupSetting = BackupMode.disabled;
+  void modeUpdater(StockMode optimism) {
     setState(() {
-      stockMode = value;
+      optimismSetting = optimism;
     });
   }
-  void settingsUpdater({StockMode mode}) {
+  void settingsUpdater({ StockMode optimism, BackupMode backup }) {
     setState(() {
-      if (mode != null)
-        stockMode = mode;
+      if (optimism != null)
+        optimismSetting = optimism;
+      if (backup != null)
+        backupSetting = backup;
     });
   }
 
   final List<Stock> _stocks = [];
   void didMount() {
     super.didMount();
     new StockDataFetcher((StockData data) {
       setState(() {
         data.appendTo(_stocks);
       });
     });
   }
 
   Widget build() {
 
     ThemeData theme;
-    if (stockMode == StockMode.optimistic) {
+    if (optimismSetting == StockMode.optimistic) {
       theme = new ThemeData.light(
         primary: colors.Purple,
         accent: colors.RedAccent,
         darkToolbar: true
       );
     } else {
       theme = new ThemeData.dark(
         primary: colors.Red,
         accent: colors.PurpleAccent
       );
     }
 
     return new Theme(
       data: theme,
         child: new Navigator(_navigationState)
      );
    }
 }
 
 void main() {
   runApp(new StocksApp());
 }