Group heading for empty cells

Hello. I'm new to SandGrid and have a question. Say a grid has grouping enabled and the user sorts by a column which contains some emtpy cells. These rows with the empty cells are then grouped together, and the heading of the group is empty. This is not so user-friendly. Outlook for example labels that group as "(none)". Is it possible to easily do the same in SandGrid w/o having to implement custom group heading drawing?

There are two solutions I can think of. You could derive from GridColumn and override the method that determines the group header text from a row. I can't remember its name, but it should be obvious. Or, you could group by a hidden column which differs from the first column by having (none) in those cells.

Personally the first option would be my choice.