Hi Adam,
The complex binding can be provided to the GridGroupingControl on the Windows forms, which is directly apply to a particular column to where the complex property has been bound.
I have attached a sample in the below location:
http://www.syncfusion.com/uploads/redirect.aspx?&team=support&file=ResetValue1854480015.zipLet me know if you have any queries.
Regards,
Nirmal