title: Javafx Window order
body: <p>Im trying to search a way to obtain the z-order of all currently showing Windows (not just Stages!) or just for a specific collection of Windows if that makes a difference.</p>
  
  <p>I have tried several options including the non-public API, but I can't seem to find any native/standard way. An alternative would be to 'register' all my Windows and listen to their 'focus-property' and determine the z-order from that information. But just the fact that you need to 'register' in order to make that approuch work is a reason for me to keep looking for a generic solution.</p>
  
  <p>Any help/suggestions are welcome, thanks in advance</p>