class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      theme: new ThemeData(
        primarySwatch: Colors.blueGrey,
      ),
      home: CupertinoPageScaffold(
        navigationBar: new CupertinoNavigationBar(
      leading: Text("lead"),
      middle: Text("Title"),
      trailing: Text("Trailing")
    ),
        child: Center(child: Text("Test!")),

      )
    );
  }
}