Hi Rohit,
Thanks for your interest in Syncfusion products.
We are sorry for the delay. We are sorry for inconvenience caused. We are unable to reproduce the issue. We have prepared a sample and video demonstrating the working of sample and the same can be downloaded from the following link.
Sample Link
http://www.syncfusion.com/downloads/Support/DirectTrac/86933/Grouping-455091991.zipVideo Link
http://www.syncfusion.com/downloads/Support/DirectTrac/86933/Grouping-231503381.zipCould you please try the above sample and get back to us whether you are able to reproduce the issue? If not, could you please give more information or by reproducing the issue in the above sample so that we could sort out the issue and provide you with solution. The information provided would be of great help in resolving the issue.
Please let us know if any concerns.
Regards,
Sridhar N