title: How to pass data to the previous page using PopAsync?
body: <p>Consider the following scenario:</p>
  
  <ol>
  <li>User is on some Page 1</li>
  <li>He clicks button that moves him to Page 2 (calling <code>await Navigation.PushAsync(new SomePage());</code> )</li>
  <li>After finishing certain action, he clicks "OK" button</li>
  <li>After clicking "OK", app calls PopAsync to move to Page 1 and sends there some data (result of activity on Page 2).</li>
  </ol>
  
  <p>How can I receive data from Page 2 in Page 1?</p>