Also with your suggestions dosn't works. Searching in the net it seems there is a problem of old and new library.
The use of jExcel is random, I can try co jPoi.
Thanks Erel
Now I use jPoi although is heavy for my purpose.
I anticipate you that I'm going to start a new post on what seems to me an error in the management of the combo box events (B4J),
regards