I just got a Char-griller Duo. How do I use the side burner with a charcoal chimney?

When I follow the chimney directions of putting newspaper underneath and stacking charcoals on top, it works, but leaves a humongous mess. Burned newspaper bits and charcoal dust end up all over the side burner, leaving a big mess that requires quite a few paper towels to clean up. Is this correct, or am I missing something? The manual for the Char-Griller Duo says that you can use the side burner to light a charcoal chimney, and it is a perfect fit.