NEW YORK — Using glass shards from a broken window as weapons, a group of teens held three staff members against their will at a Bronx juvenile detention center this week, law enforcement sources told the Daily News. The disturbance in Hall G of the Horizon Juvenile Center on Brook Ave. near Westchester Ave. in Mott Haven erupted Monday evening when several teen detainees got angry and tension built because lunch had arrived late that day, law enforcement sources said. The teens threatened three staffers — a 24-year-old man, a 30-year-old man and a 37-year-old woman — and prevented them from l…