>As I wanted to start a new application with an its own controls class library, i was thinking to duplicate the vfp standard class but I can't remember where it's placed and its name....to be honest i don't even know if it does really exists :)
>

Do you mean the VFP base classes? They are not located in a VCX, you can just derive your first-level custom classes from "Form", "Textbox", and so on. See also ALanguage() in Help:

lnClasses = ALANGUAGE(laClasses,3)
DISPLAY MEMORY LIKE laClasses

hth
-Stefan