Hi Anuvrat,
We appreciate your interest in Syncfusion Products.
I am not able to understand your query clearly. If your intension is to hide +/- cell if there is only one record in a group, then please see the follwing KB article.
http://www.syncfusion.com/support/kb/grid/Default.aspx?ToDo=view&questId=251Please let me know if does not meet your requirement.
Regards,
Jisha