title: Highlight a Scroll Bar
body: <p>I want to highlight some portions of the scroll bar like highlight search in google chrome.</p>
  
  <p>See <a href="http://dl.dropbox.com/u/17404614/scrollbar.JPG" rel="nofollow">http://dl.dropbox.com/u/17404614/scrollbar.JPG</a></p>
  
  <p>Is it possible to use Qt to achieve this?</p>
  
  <p>Thanks</p>