Extensible

Expression fields let users add new columns with formula expressions. The Grouping Engine comes with its own extensible formula engine. Expression fields can be used in records just like a regular field. Users may create summaries, group, sort or create filters based on expression fields.

The following picture shows a GridGroupingControl with the 'Totals' expression field. It is calculated based on unit price and quantity. A summary for totals is shown at the end of the group.