title: Smart-Gwt ScrolledHandler usage
body: <p>I would like to do something when a scroll event has occurred on a smartgwt window. I'm assuming that an event will be fired when at least one of the following has happened: scroll within window with mouse scroll wheel, scroll by dragging scroll bar, or scroll using scroll arrows.</p>
  <p>I've added a handler to a smartgwt window and also to the smartgwt canvas which is the only child of the window. Both have been set up to write to GWT.log.</p>
  <p>However, I can't seem to get a <code>ScrollEvent</code> to fire.</p>
  <p>Any ideas?</p>