title: QDialog with ok and cancel buttons
body: <p>I need Qt Dialog with ok and cancel buttons with standard functionality, placed on the right side of its layout. I need to inherit from it and add other widgets to its layout. I can implement it myself, but maybe there is something standard, in that case I prefer to use it, since it will be more portable.</p>
  
  <p>QMessageBox shows a message, I need something more general, only QDialog and standard buttons, or maybe QDialog has an option which activates them.</p>