Handling Enter key presses on Buttons in JavaFX

[Robert Lichtenberger]

> 2) Do we want to have different behaviors for OS X and non-OS X? I'm a
> newly inducted member into the cult of Mac, and I don't yet have all
> my bearings sorted out, so I don't have a strong opinion here.
Please don't make different OSes behave differently as this is a real 
pain. I would much prefer, if JavaFX-Applications behave the same on all 
platforms.