Hi Adam,
Thank you for evaluating Syncfusion Products.
I am able to reproduce the issue reported by you. The Shared.Web assembly is shipped with jQuery 1.2.6 version, since dialog() is available in the latest jQuery version 1.3.2 and hence this issue arises.
To resolve this issue, we would suggest you to add the latest jQuery 1.3.2 reference after the GridGroupingControl is loaded and this will overwrite the previous version.
Please refer the sample below which illustrates the above.
http://files.syncfusion.com/support/GGC.Web/7.1.0.30/F80373/main.htmPlease let me know if you have any concerns.
Thanks,
Rekha