Hi Peter,
Sorry for the inconvenience caused.
We are able to reproduce the issue with SelectedItem in GridDataControl when the items are grouped in the version 8.2.0.18. We have fixed this issue in the latest version(9.2.0.138) of Syncfusion products. Could you please upgrate to our latest version?
Release Details:
Version: 9.2.0.138
Download link:
http://www.syncfusion.com/support/forums/general/99684/Essential-Studio-2011-Volume-2-Service-Pack-Release-v920138-available-for-downloadPlease let us know if you have any queries.
Regards,
Deenadhayalan