title: How to display a NSMenu with a search box to limit the number of results (similar to Xcode menus)
body: <p>This kind of menus are available in Xcode when searching for a function name (see attached image):
  <img src="https://i.stack.imgur.com/nX1Yj.png" alt="enter image description here"> </p>
  
  <p>Is it a standard NSMenu with a customized item?</p>
  
  <p>Is it a fully customized NSWindow, with customs NSViews?</p>
  
  <p>Is there an open-source library that can offer such function?</p>
  
  <p>Any advices to implement such menu?</p>