Hi Boban,
Les Pinter has a web site, which might give you the help you require. There are various articles under the Learning Center button (you have to scroll down to see all the titles. One title is "219 English Subclass the VFP Controls" at
http://www.lespinter.com/.
A second place would be Eldor Gemst's web site under articles and
download the files for "Intro", "Raw", "Final", and "Nextid" as a good starting point.
http://www.elgem.com/.
In addition, there is the hentzenwerke web site, which has various books on VFP
http://www.hentzenwerke.com/