@Override
    public void bind(Nifty nifty, Screen screen) {
        System.out.println("bind(" + screen.getScreenId() + ")");
    }
Nifty invokes this method when the screen gets enabled for the first
time.

@param nifty (not null)
@param screen (not null)
jme3-examples/src/main/java/jme3test/niftygui/StartScreenController.java