Thank you very much it works perfectly well !
It was so simple...!
I have not thought distributing it to the public because I am a beginner in Java and I've not made things very properly... I have modified methods without comments... And furthermore I have not followed the MVC architecture for my extension. I think my work cannot be distributed to the public.
But if somebody contacts me by Private Message I would share my work with pleasure.
I really wonder how you can still be so active 7 years after the beginning ! Thank you for you investment in it M. Puybaret
!