title: Qt on Mac -- how to access "search" in help menu
body: <p>I am porting my Qt app to Mac OS X. On Windows/Linux I've used a QLineEdit to provide a search feature in the Help menu.</p>
  
  <p>In Mac OS X, I saw something like this is built-in:
  <img src="https://i.stack.imgur.com/sGOef.png" alt="enter image description here"></p>
  
  <p>How can I access this search bar with Qt (i.e., add my own elements to it)? I looked at QMenuBar in the docs but couldn't find anything relevant. If it's not possible, can I at least use some native API from my C++ Qt app?</p>
  
  <p>Thanks a lot.</p>