Thank you,
How can I refresh a dataset?
The help file show this: Function Refresh: boolean;
It's return boolean or I must to pass a boolean value for it? (sorry by this
question)

>
> Are you trying to share a dataset between a lookupcombo and a separate
> form used to manage records in the lookup table ??? You cannot do
> that! You must have a one dataset (TIB_Query or whatever) for the
> lookupcombo and another separate dataset for the form used to insert
> records into the lookup "ProductType" table. After you have done an
> insert refresh the dataset attached to the lookupcombo so that it will
> see the new record.