title: ? button functionality for another button
body: <p>I have made peace with the fact that I cannot have both help button and minimize button at the same time, i want to implement the <code>?</code> button functionality to another button.
  <a href="https://i.stack.imgur.com/UQvyn.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/UQvyn.png" alt="enter image description here"></a></p>
  
  <p>I want this button functionality(QWhatsThis) in <code>Help</code> button(shown above):
  <a href="https://i.stack.imgur.com/8lPp2.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8lPp2.png" alt="enter image description here"></a></p>
  
  <p>I want to try <a href="https://stackoverflow.com/questions/9039056/qt-qmainwindow-with-a-close-minimize-and-help-button">this</a> but not sure how to implement and <a href="https://stackoverflow.com/questions/11140090/add-help-button-but-keep-maximize-and-minimize">even this</a>.</p>