When he was appearing on the series "Day By Day" in 1988, columnists and pundits predicted a "big career" for tall, lanky Christopher Daniel Barnes. But that series didn't last and it took seven years and a turn as Greg Brady trying to lure "groovy chicks" in "The Brady Bunch Movie" (1995) for Barnes to get the kind of showy role that would offer name recognition. Acting professionally since he was eight years old, often as under the stage name 'C.B. Barnes', he moved with his family from his native Portland, ME, in 1981 and began acting in TV commercials, racking up credits in over 100. A