Hi Saurabh,
Thanks for using Syncfusion products.
Please set the EnableCallback property to false, and place the Grid inside the GridGroupingControl, then you won’t have full page refresh on expanding/collapsing the groups.
Please refer the video clip which illustrates the above:
http://www.syncfusion.com/support/user/uploads/refresh_8099d437.zipPlease have a look at the sample from the below link:
http://www.syncfusion.com/support/user/uploads/Sample_2245517e.zipPlease let me know if you have any other concerns.
Regards,
Raji