title: Clear prompt text in JavaFX TextField only when user starts typing
body: <p>The default behaviour is that the prompt text in the field is erased as the field is being focused. That is when the marker is in the field. </p>
  
  <p>Is it possible to configure the textfield so the prompt text is only erased when the user have started typing? </p>
  
  <p>Otherwise I need to add a label beside/over each textfield for description of the value in it. </p>