title: Block owner window Java FX
body: <p>I would like to block the owner window for a popup in JavaFX.</p>
  
  <p>I initialize my popup like this:</p>
  
  <pre><code>popUp = new Popup();
  popUp.getContent().add(content);
  popUp.show(pane.getScene().getWindow());
  </code></pre>
  
  <p>With this, I can still work in the first window (pane window). I would like to disable this action and I would like the user just works in the popup.</p>
  
  <p>How to do this ?</p>
  
  <p>Thanks.</p>