title: How to intercept Navigation Bar Back Button Clicked Prism Xamarin Forms?
body: <p>Basically Its the same question from <a href="https://stackoverflow.com/questions/31696595/how-to-intercept-navigation-bar-back-button-clicked-in-xamarin-forms">Here</a> but the solution dosen't work for Prism MVVM because the <code>OnOptionsItemSelected(IMenuItem item)</code> in the <code>MainActivity</code> never get raised.
   For the hardware button I'm using on that page:</p>
  
  <pre><code>protected override bool OnBackButtonPressed()
  {
      return !PageUtilities.CanNavigate(this, null);
  }
  </code></pre>