title: how to display a message box using openGL in visual C++
body: <p>How to display a message box on the window which is created when we execute a visual c++ program using openGL.
  Specifically i want to display a message and one "OK" button.So when the user clicks on OK button it should resume to the same state as it was before that message box.</p>
  
  <p>Thank you</p>