The trial court shall not grant a demand for a trial by jury filed after the time fixed in T.R. 38(B) has elapsed except upon the written agreement of all of the parties to the action, which agreement shall be filed with the court and made a part of the record. If such agreement is filed then the court may, in its discretion, grant a trial by jury in which event the grant of a trial by jury may not be withdrawn except by the agreement of all of the parties.
Ind. R. Civ. P. 38