(a) At the death of a community-property spouse, the surviving community-property spouse or a personal representative, heir, or nonprobate transferee of the decedent may assert a right based on either of the following acts:
(1) An act of the surviving community-property spouse or decedent during the marriage or other relationship under which community property then could be acquired.
(2) An act of the decedent that takes effect at the death of the decedent.
(b) In determining a right under subsection (a) of this section and corresponding remedy, the court shall apply equitable principles and may consider the community property law of the jurisdiction where the decedent or surviving community-property spouse was domiciled when the property was acquired or enhanced.