title: how to enforce selection from the suggestBox list in gwt
body: <p>Hie</p>
  
  <p>We are using a gwt SuggestBox which shows suggestions as user starts typing into this box. however, there is a possibility that end user just type something and do not select anything from the list.</p>
  
  <p>we want to avoid this use case and display error if user do not select anything from the list.</p>
  
  <p>any advise on how can we implement this? The real issue is how to get the list of current suggestions which are display? i dont see any method in suggestOracle class to get the list?</p>
  
  <p>So, anyway without firing another query to get the current list of displayed suggestions?</p>