title: disable back button xamarin.forms
body: <p>I am sorry, if this question is asked before, but I am unable to find my answer that is why I am asking again this question.
  My Scenario is I have placed a back button on my <strong>axml views</strong> from which I am performing Navigation of Going back on previous views using <strong>GoBack()</strong> Method. </p>
  
  <p>what I need I want to disable back button on my hardware so that my app should not go back to previous screens which are available in the <strong>navigation stack</strong>. I am using <strong>Prism MVVM</strong> for my app, so is there any possibility to disable this button or have some overrideable action method on my ViewModel from which I should stop it.</p>
  
  <p>Hope you could understand my question.</p>
  
  <p>B.R</p>