> Include the field ChangeAll in the dataset as a client-side calculated
> field. Do you know how to do that?
>
> Then, in the dataset editor, set up its ColumnAttributes so that it is a
> Boolean with a True value 1 and False value 0; set its default value to 0
> and set its Required property to True (to avoid having the "grey" null
> value in the cycle).

So I did, works perfectely.

Thanks very much.

Florian