Any person committed to the commissioner of corrections from a county having a probation officer of a juvenile court may be placed on probation by the commissioner under the supervision of the probation officer who shall assume supervision as though it were pursuant to a judgment or order of the juvenile court. The probation officer shall cooperate with the commissioner of corrections in providing treatment for the person consistent with the purposes of this chapter, but nothing therein shall give the commissioner direction or control over the probation officer or require the probation officer or subordinates to perform duties not otherwise required by law.