title: Tabbed Presenters updated Example
body: <p>I'm trying to implement tabbed presenters following the example (http://code.google.com/p/gwt-platform/source/browse/gwtp-samples/gwtp-sample-tab/), but, reading some classes javadoc, I see some differences... 
  and could not implement a example like this, gotting various GIN errors like</p>
  
  <pre><code>Deferred binding result type PresenterA.CadastroPrefeituraProxy' should not be abstract
  </code></pre>
  
  <p>Is there a new example or new way to implement that?</p>