>Good idea, George. It might be even easier to implement this idea in VFP 8 using BINDEVENT()function. Instead of creating separate _Assign methods one can bind the necessary properties to one custom check method, that fire whenever any bound property is changed and will validate all the properties.

Nick,
How do you go about binding properties? I would think you would still need an _ASSIGN for each property and then bind each _ASSIGN method to one custom check method. I'm not sure, in my mind, if this buys you anything other than adding a level of complexity (i.e. another method call).