Bug in PopupMenu

[theUser BL]

> So the "Fancy Design with CSS" with the coded GUI have the popup-bug.
> Here the code: http://docs.oracle.com/javafx/2/get_started/LoginCSS.zip
>
> But the same program created with FXML ("User Interface Design with FXML") have not that bug.
> Here the code: http://docs.oracle.com/javafx/2/get_started/FXMLExample.zip

Seems that the bug is only, if it is coded AND with css.
The normal program without css works fine without bug, too:
Here the code: http://docs.oracle.com/javafx/2/get_started/Login.zip

Greatings
theuserbl