No. 80-1421 Opinion filed April 6, 1981. APPEAL from the Circuit Court of Cook County; the Hon. JOHN J. HOBAN, Judge, presiding. Sneider Troy, of Chicago (James R. Sneider and Randy G. Black, of counsel), for appellants. J. William Stefan, of La Grange, for appellee. Mr. JUSTICE O'CONNOR delivered the opinion of the court: Plaintiff Brian Barrows sued defendants Maco, Inc., and Maco Coatings, Inc. (collectively, Maco), for sales commissions alleged to be due under a written contract. Defendants counterclaimed