title: JavaFX Menu - first letter, underline decoration
body: <p>Following the UI standards:
  If application menu item (on the top menu bar) opens a dropdown, it MUST be decorated as it is shown under:<img src="https://i.stack.imgur.com/8A9gR.jpg" alt="Decorated menu item first letter">
  The first letter has "text-decoration:underline" property.
  But accoring to this <a href="http://docs.oracle.com/javafx/2/api/javafx/scene/doc-files/cssref.html" rel="noreferrer">http://docs.oracle.com/javafx/2/api/javafx/scene/doc-files/cssref.html</a>
  I can't do like that in in javafx app. </p>
  
  <p>Any suggestions?</p>