Section 10-9.1. Revocability of a power of appointment

(a)  A  power  of appointment is irrevocable unless the donor reserves
  the right to revoke it.
    (b) An exercise of power of appointment is irrevocable whenever:
    (1) The donor of a special power  manifests  his  intention  that  its
  exercise be irrevocable, or
    (2) The donee does not manifest in the instrument exercising the power
  his intention to reserve a power of revocation.
    (c)  If the donee in exercising a power reserves a power to revoke the
  appointment, but does not expressly reserve a power to  reappoint,  upon
  the exercise of the power of revocation, the donee can reappoint.
    (d)  An  instrument  exercising  a power of appointment is affected by
  fraud in the same manner as a deed or will, executed by an owner or by a
  trustee of property.