Thanks for your answer bau my problem is not receive the data selected.
I try to make an example of a gridview contain the invoices of a client. It's OK.
Now i want to expand the gridview to see (inside the grig view) the lines of the invoice.
I can see the header of the details but i can't see the lines.
I don't know how i can send you a print to explain wath i want to do.