Regarding the prg-based member classes (thanks again), I pointed the grid's MemberClass and HeaderClass properties to them as you suggest, but when I increase the grid's ColumnCount my custom classes aren't used.

That is bizarre. I have no probem with my custom grid classes using my custom columns. I wonder what you are doing differently...

Is there something else that needs to be done, or is this a bug?

Probably a bug...in your code < s >. Care to post some?