title: Apply background image to a Qmenu
body: <p>I need to apply an background image to a Qmenu. So far I only can put a color as a background. It seems the property background or background-image isn't work (using qss stylesheet).
  I've tried applying styles within the code. The same results. Any suggestions?
  Just in case, I'm using Qt Creator 2.0.1 with QT 4.7 in mac OSx.</p>
  
  <p>Thanks in advance.</p>