title: how can I use PropertyChangeListner in GWT? or is there any better way of doing it?
body: <p>I am trying to get the upload progress information from a servlet in GWT but <code>SubmitCompleteHandler</code> returns after completion of the server upload and the response retuned by the servlet. 
  Is it possible to get the upload progress using <code>PropertyChangeListener</code>?</p>