title: hiding Tabbar during navigation
body: <p>My main screen has got AppBar and BottomNavigationBar. if I navigate to screen 2 BottomNavigationBar is staying. It is perfect for me.</p>
  <p>But I would like to remove the Tabbar for screen 2. Because the content of Screen 2 is irrelevant with the TabbarMenu.</p>
  <p>I am going to screen 2 from screen 1 <code>return Page2</code> like this:</p>
  <pre><code>Widget showPage(int selectedPage) {
      if (selectedPage == 0) {
        return const NewsView(id: '1');
      } else if (selectedPage == 1) {
        return const Settings();
  </code></pre>
  <p>any help?</p>