title: Focus ViewCell Entry on ListView item selection
body: <p>I have a Xamarin.Forms ListView with a custom ViewCell that contains a StackLayout with an Entry and Label. I'd like the Entry to get focus any time that the ViewCell is selected.</p>
  
  <p><code>ItemSelected</code> provides the item that is selected, but not the ViewCell. I can create a custom class for the ViewCell, but I don't see how it can know when it is selected.</p>
  
  <p>How can I focus the Entry upon ListView item selection?</p>