Datagrid sorting

[Marcello Bertoli]

Hi all,

I need to sort the lines of a datagrid with more than one criteria.

For instance:

The datagrid represents invoices with these columns:

- invoice date
- invoice number
- invoice title

When I click on the invoice date header I would like to sort the lines of the invoice datagrid first by invoice date and then by number.

Is it possible?

Thanks in advance
Best
Marcello