The case management judge steps in at the preliminary phase of the trial, where the trial judge, per se, has not yet stepped in. If this case is proceeding before a youth court, of course this case management judge would need to come from that court as well. The case would only involve young offenders and it would not involve any adults, as was pointed out recently in 2009 by the Supreme Court of Canada. You can't have a joint trial with an adult and a young offender.
On June 21st, 2011. See this statement in context.