Hello,
I want to implement in the header 3 rows: the month, the week number, and the day number. I have tried with CellGroupBy but without succes. Thanks for your help.
Please see here, this feature is new in DayPilot Pro for ASP.NET WebForms 6.9:
http://www.daypilot.org/daypilot-pro-for-asp-net-webforms-6-9.html