>But I cannot find when should I call this in PG.
>The only way to build windows in PG is just call FN pGbuild.

Once upon a time, someone (I believe it was Greg Neagle) built a 
GROW.FLTR for PG:PRO that allowed you to create windows with grow boxes 
but without the scroll bar areas. Last I heard, this still worked just 
fine, and could be found in the Ariel archives.

-Mars