Tried it with Java8 and Java9. In both is the same bug.

I have tried out the tutorial programs at
on Linux 64bit.

And that is the result of the popup-window:

So the "Fancy Design with CSS" with the coded GUI have the popup-bug.
Here the code:

But the same program created with FXML ("User Interface Design with FXML") have 
not that bug.
Here the code:

Thats also something, which me wonder. I thought, that there is no difference 
between creating something with FXML or creating it direct in code, vecause 
FXML is based on it. But it seems, that it isn't so.



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