title: JavaFX: Focusing textfield programmatically
body: <p>I wrote an application with JavaFX which will only be usable with keyboard's arrows.
  So I prevented MouseEvent on Scene's stage, and I "listen" to KeyEvents.
  I also switched off focusability of all nodes :</p>
  
  <pre><code>for(Node n : children) {
       n.setFocusTraversable(false);
  </code></pre>
  
  <p>Now I have some textfields, checkboxes, and buttons.
  I would like to change the state of my input controls (textfield, checkbox,..) programatically: for example I would like to enter the textfield to edit the content programatically.
  So my question is: how to enter in a non-focus-traversable textfield?
  Because textfield.requestFocus(); doesn't work anymore since I set false to focustraversable property of my textfield.</p>
  
  <p>Thanks</p>