a. A party is entitled to be represented by counsel in all proceedings. b. A juvenile may waive the right to counsel in a proceeding under subdivision (2) or (3) of subsection 1 of section 211.031, RSMo, only with the approval of the court. c. Waiver of counsel by a juvenile may be withdrawn at any stage of a proceeding under subdivision (2) or (3) of subsection 1 of section 211.031, RSMo, in which event the court shall appoint counsel for the juvenile if required by Rule 115.02 a.