When I put the Calendar control inside a update panel I get the following error. see attached image.
The error occurs when you follow the follwing sequence.
Click DAY > WEEK > MONTH > YEAR > TASK > DAY >WEEK > MONTH
On the last MONTH button click exception in thrown saying
Sys.InvalidOperationException. Two components with same id 'gCalendar_gCalendar_ct100_CalendarMonthGrid' cannot be added to the application.
I don't get this error if I remove the UpdatePanel.