title: Is there a way to tell when a Widget is shown with GWT?
body: <p>I'd like to respond to an even whenever my widget is made visible on a page done with GWT and UI Binder.  </p>
  
  <p>Is there anything similar to the <code>onAttach()</code> event handler (which fires when the widget is added to the DOM), pertaining to when the widget is actually made visible?</p>
  
  <p>I'd like to be able to handle the even when the widget is shown because there are a few different ways of making it visible, and I'd like a single place on the widget itself that can handle this event.</p>
  
  <p>Thanks</p>