title: How to receive scrollbar mouse events for QGraphicsView
body: <p>In qt widget <code>QGraphicsView</code> I want to detect mouse-press, mouse-release and mouse-move events. 
  I derived a class from <code>QGraphicsView</code> and I have overridden the following functions:</p>
  
  <ul>
  <li>mousePressEvent(QMouseEvent *event)</li>
  <li>mouseReleaseEvent(QMouseEvent *event)</li>
  <li>mouseMoveEvent(QMouseEvent *event)</li>
  </ul>
  
  <p>Now I can detect these mouse events almost everywhere, except for the area where are the scroll bars, which are part of <code>QGraphicsView</code>.
  I want to be able to catch these events and move the scroll bar manually.</p>
  
  <p>Edit:<br>
  I am trying to simulate second mouse in windows environment sending WM_LBUTTONDOWN,... events. I would like to be able to detect this events also for scroll bars in <code>QGraphicsView</code>.
  Besides detecting the events I would like to know the event->x() and event->()y position. </p>