Hi Rick,
Thanks for using syncfusion Products.
We have prepared a simple sample to demonstrate the Three Level Hierarchy Editing and the same can be downloaded from the below link.
Sample Link:
http://www.syncfusion.com/downloads/Support/DirectTrac/91450/ThreeLevelHierarchy-2013903619.zip the DataSourceControlRowUpdating event of gridgrouping control gives you the updated row values(new and old values).
Please try the above sample and let us know if you need further assistance.
Regards,
Bala Murugan A.S