title: Display a popup with xamarin forms
body: <p>I want to display a small popup in a xamarin forms application (iOS/Android PCL)</p>
  
  <p>I am actually working with a ContentPage (XAML + C# code)</p>
  
  <p>and i am showing this popup with:</p>
  
  <pre><code>await Navigation.PushModalAsync(mypopupinstance)
  </code></pre>
  
  <p>It works fine, but the popup is on the full screen. I just want a small popup and i want to see what is behind.</p>
  
  <p>Thanks</p>