This subtitle applies:
(1) to all trusts created on or after January 1, 1984, and to all transactions relating to such trusts; and
(2) to all transactions occurring on or after January 1, 1984, relating to trusts created before January 1, 1984; provided that transactions entered into before January 1, 1984, and which were subject to the Texas Trust Act, as amended (Articles 7425b-1 through 7425b-48, Vernon’s Texas Civil Statutes), and the rights, duties, and interests flowing from such transactions remain valid on and after January 1, 1984, and must be terminated, consummated, or enforced as required or permitted by this subtitle.