title: Field validation in RadListView
body: <p>When I validate my fields in <code>RadListView</code>, I'd like to be able to present a message to the user about validation errors. Using <a href="https://play.nativescript.org/?template=play-ng&amp;id=Q0J9Ft&amp;v=12" rel="nofollow noreferrer">this example project</a>, I get either overlaps or gaps in the list as the resizing of the items isn't reflected. If I call <code>.refresh()</code> on the <code>RadListView</code> as has been suggested in other answers, it removes my <code>TextField</code> focus.</p>
  
  <p>Does anyone have any suggestions for a way to tackle this in nativescript-angular?</p>
  
  <p><a href="https://i.stack.imgur.com/DT6Ca.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/DT6Ca.jpg" alt="validation overlap"></a></p>