title: How to listen when a pane comes to front in StackPane (JavaFX)?
body: <p>So here is my problem. In JavaFX, I have created a StackPane and I added various other panes in it. There result is as shown on the picture below. When I click on the buttons below the corresponding Pane appears by use the "toFront()" method. I would like to create listeners on all Panes that will fire whenever they come up to front.
  I have tried to use the </p>
  
  <pre><code>pane.sceneProperty().addListener((obs, oldValue, newValue) -&gt; {});
  </code></pre>
  
  <p>but is not working in my case, as the panes are already children of the StackPane, hence already in the scene.</p>
  
  <p>What I am trying to achieve here is to listen whenever a pane/node is actually rendered in the scene. As far as I understand, panes in the stackpane that are behind the front pane are not rendered.</p>
  
  <p>Regards,
  Johny</p>
  
  <p><a href="https://i.stack.imgur.com/LHUEF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/LHUEF.png" alt="enter image description here"></a></p>