Hi Alexey,
Thank you for using Syncfusion products.
The issue with -
'ClientSideOnAllDayAppointmentClick cannot to be wired for AllDayAppointment in the schedule Month view' has been confirmed as a defect and our Developers are working on fixing this issue. The fix for this issue is expected to be available on February 10th 2009 and we will get back to you on the specified date with more details.
We would suggest you to have a look at whats new in our latest version in the below link.
http://www.syncfusion.com/products/whatsnew/aspwhatsnew.aspxPlease let us know if you have any other concerns.
Regards,
Selva.