QMessageBox is not being centered to its parent in Mac OS.

QMessageBox is not being centered to its parent. Even not able to move to center by move() method. Neither the exec call not the static methods display the window at center. Please refer to the attached example. This just a simple example. The project I am working on has many message boxes based on different events and scenarios and it is very annoying to have my main window somewhere and a message box somewhere else not even overlapping the main window geometry (when I move my main window to a corner of the screen).