title: Context menu using C++/Qt
body: <p>I have written C++ code for video display and want to set contextmenu on the video screen as in vlc player occurs. But What happens when I right click on the border of the screen the popup window appears not on the central widget. What is desired that if its clicked anywhere
  the popup should be displayed, but it's not happening.</p>
  
  <p>Please help me..</p>
  
  <p>Thanx in advance </p>