When I was tweaking my previous works, it was AS2 (back in 2005 I think it was the only thing possible)... but the example I gave in my first post was using a clean project, I guess it was considered as AS3? Or the instructions should be used in some particular way to be considered AS3?
I've just saved it as FLA and put it in FileDropper, is it possible for you to check it?
http://www.filedropper.com/mytest
Thanks again.