title: JavaFX Click through overlaying stackpane
body: <p><img src="https://i.imgur.com/TMlKICc.png" alt="schematic"></p>
  
  <p>As you can see in the drawing above, I have a stackpane containing two elements, a BorderPane (which again contains a canvas and a statusbar) and another stackpane (which contains some other UI things).</p>
  
  <p>I'd like to be able to click through from invisible areas of the green stackpane to the yellow borderpane but still allow clicking on actual UI stuff on the green stackpane (where there is clickable things like buttons etc.).</p>
  
  <p>How do you do this?</p>