dart - 플러터 - 네비게이터가 돌아 오지 않음 (검은 색 화면)

플러터를 처음 접했고, 서랍 메뉴와 본문 목록이있는 홈페이지가 있습니다.

DRAWER MENU =>서랍 메뉴의 탭 항목 목록에서 PAGE 웹 URL을로드하고 있으며 BACK을 탭하면 내 홈페이지로 돌아갑니다. 아주 잘 작동합니다.

BODY LIST CONTENT =>탭 항목 목록에서 페이지 웹 URL을 잘로드하지만 내 홈페이지로 돌아가고 싶을 때 검은 화면이 나타납니다. (

Homepage.dart

class HomePage extends StatefulWidget{
  @override
  State<StatefulWidget> createState() {
    // TODO: implement createState
    return _HomePage();
  }
}
class _HomePage extends State<HomePage>{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    var globalContext = context;
    return Scaffold(
      appBar: AppBar(
        title: Text(
            'Benvenuto',
            style: TextStyle(color: Colors.white)
        ),
        backgroundColor: Color(0xFF4035b1),
      ),
      drawer: Drawer(
        child: new Column(
          children: <Widget>[
            new UserAccountsDrawerHeader(
                accountName: Text('VIA ALBERTO POLIO 54'),
                decoration: BoxDecoration(
                    gradient: LinearGradient(
                        colors: [
                          Color(0xFF4268D3),
                          Color(0xFF584CD1)
                        ],
                        begin: FractionalOffset(0.2, 0.0),
                        end: FractionalOffset(1.0, 0.6),
                        stops: [0.0, 0.6],
                        tileMode: TileMode.clamp
                    )
                ),
                accountEmail: Text('ORARI: LUNEDI - VENERDI 9:30 / 19:30'),
                currentAccountPicture: new CircleAvatar(
                  radius: 50.0,
                  backgroundColor: const Color(0xFF778899),
                  backgroundImage: AssetImage("assets/img/icon_logo.jpg"),
                )
            ),
            // This list work well! 
            ListTile(
                leading: new Icon(Icons.arrow_forward_ios),
                title: new Text("TEST"),
                onTap: () {
                  Navigator.of(context).pop();
                  Navigator.of(context).push(MaterialPageRoute(
                      builder: (BuildContext context) => Page("title", "www.google.com")));
                }
            )
          ],
        ),
      ),
      // The menu on my body load well the page web url but doesn't return back to my homepage. 
      body: new Column(
          children: <Widget>[
            ListTile(
                leading: new Icon(Icons.arrow_forward_ios),
                title: new Text("TEST"),
                onTap: () {
                  Navigator.of(context).pop();
                  Navigator.of(context).push(MaterialPageRoute(
                      builder: (BuildContext context) => Page("title", "www.google.com")));
                }
            )
          ])
    );
  }
}

Page.dart

class Page extends StatelessWidget{
  final String titleText;
  final String urlSource;
  Page(this.titleText, this.urlSource);
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return new WebviewScaffold(
      url: urlSource,
      appBar: new AppBar(
        title: Text(titleText),
      ),
      withZoom: true,
      withLocalStorage: true,
      hidden: true,
    );
  }
}

main.dart

void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.green,
      ),
      home: HomePage()
    );
  }
}

도와 주셔서 감사합니다!