(thanks for your fast answer).

Yes, this is what I mean. Having prev and next button in this case.

I was able to add buttons, doing something like that

Ok! Great!

My navigation arrows appear on my add form. But nothing append (of course) when I press them.

I guess that's why you wrote

“but you will have trouble when you use them.”

Do you have an idea of the best way to make them work?

Thanks again for your help and you time.

Cyril