Hi Zach,
How can I edit the cell of a GroupCaptionSummaryCell manually?
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Here is a forum thread that discuss with the similar issue. Please try this and let me know if this helps.
http://www.syncfusion.com/support/Forums/message.aspx?&MessageID=49541Summary Changed event.
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Here is a forum thread on this topic.
http://www.syncfusion.com/Support/Forums/message.aspx?&MessageID=54689 Best Regards,
Haneef