Please note that VFP windows are not actually same as VB, VC++, Delphi, etc... windows. VFP does not create "window handler" [HWND] for every control like common windows applications. This way it provides compatibility with Mac, saves system resources and protect application against MS-Windows GDI bugs. But techniques based on scanning window handlers will never work with VFP windows.
"Skinning" VFP forms (if it possible) may be done only internally form VFP (as I said it hides window structure).
/A new technology turns into completely outdated stuff before you have a time to read "Getting Started..." section.
/If there are some "system programmers" then others are unsystematic.