CLASS-KEY CHEW-PO COMMERCIALS, the newly expanded ad division of Klasky-Csupo, recently completed the first in a series of ads for Burger King Kids Club. The 30-second spot, "Sketchbook," which aired nationally in November on Spanish-speaking television networks features an artistic Latin boy, "Lingo," who is a member of the Burger King Kids Club. The spot was directed by Bonita Versh, executive produced by John Andrews and Liz Seidman and developed by San Antonio, Texas-based ad agency Bromley, Aguilar and Associates.