Hi Chris,
Thank you for your interest in syncfusion product.
The GridGroupingControl does not have default property for an column selection. It can be acheived through some work around in the SelectionChanging event to acheive this behaviour.
Please refer the sample below:
http://files.syncfusion.com/support/samples/Grid.Windows/Forums/F80984/main.htmLet me know if you have nay queries.
Regards,
Lingaraj S.