title: File upload with a progress bar, or accessing the Html 5 File Api from Google Web Toolkit?
body: <p>I'm looking for a way to do file uploads, with a custom progress bar, with google web toolkit. Not looking for a plugin which shows its own progress bar, I'm rather looking for something which will call my callback method and notify it of progress, so I can show my own progress bar.</p>
  
  <p>If that's not possible, then I'd like to know how to access the HTML5 File API so I can build my own file uploader widget.</p>
  
  <p>Any ideas?</p>
  
  <p>Thanks.</p>