 However, other types of "inter vivos" trust are incapable of binding after-acquired property or operating so as to, whether automatically, semi-automatically or no automatism at all, bind such property as and when it is received.No separate declaration of trust is required in the case of property acquired after the execution of a will for it to form part of a secret trust.Looking at the definition of a "testamentary disposition" and "inter vivo trust" as applied in other sorts of cases is inconclusive.