title: Avoid back button using vaadin
body: <p>I develop RIA application using Vaadin CDI addon. 
  About the app : it has two views(viewA and viewB) which maintained by Navigator.
  User story is pretty simple: </p>
  
  <ol>
  <li>User enters viewA</li>
  <li>Perform some business stuff</li>
  <li>Redirects to viewB</li>
  <li>Using address bar to go some external website(ex. google.com)</li>
  <li>Press back and it goes to he lastest page what he saw(viewB), instead of viewA</li>
  </ol>
  
  <p>Any suggestions/tips-n-tricks how to avoid redirecting to viewB, but redirect to viewA?</p>
  
  <p>Vaadin Forum quiet about this thing.</p>
  
  <p>Thank you</p>