Hi Karver,
Thank you for your interest in Syncfusion product.
I am unable to reproduce the issue in GridGroupingControl, when the current cell record value has been retrieved in TableControlCurrentCellEditingComplete event. I have tried with created sample with your mentioned code. Also I have attached the sample in below link:
http://files.syncfusion.com/support/samples/Grid.Windows/Forums/GGCRecord.zipPlease let me know if still face the issue, try reproduce the steps in this sample it would be helpful to analyze the more details on the issue.
Regards,
Lingaraj S.