title: How do I create an alert popup from my ViewModel in Xamarin?
body: <p>I'm developing my Xamarin app with the MVVM pattern. I want to display an alert to the user when the user presses a button.</p>
  
  <p>I declare my ViewModel with     </p>
  
  <pre><code>class MainPageViewModel : BindableBase   {
  </code></pre>
  
  <p>Unfortunately, I'm not able to access a <code>Page</code> object from within the ViewModel directly. How do I best go about displaying my alert?</p>