title: Javafx : Activate a tooltip with a button
body: <p>I'm using JavaFx for a little app and a want to display a tooltip on a textArea when the user is clicking on a "help" button.</p>
  
  <p>No problem for linking a tootltip to my textArea, but no way to activate it when the user click on the button. Is there a way to do that?</p>