> > if DataSource.Dataset is TIB_BDataset then
> > with DataSource.Dataset as TIB_BDataset do
>
> this is overkill; once you've done the "is" check you
> can safely hardcast.
>
> if DataSource.Dataset is TIB_BDataset then
> with TIB_Dataset(DataSource.Dataset) do

A worthwhile note. Its what I get for cut-n-paste :-)

Thanks

Geoff Worboys
Telesis Computing