Section 3-504 - Fund plans in general(a) A trust company shall establish and maintain a common trust fund only in accordance with a fund plan that is approved:(1) By resolution of the board of directors of the trust company; and(b) Notwithstanding any provision of law that applies to a participating fiduciary account, a fund plan controls: (1) Participations in the fund; and(2) The rights and benefits in participating accounts of all persons who have interests in the fund.