So through a bunch of trial and error yesterday I made the determination that the Name method is apparently required. If the TreeListCustomCommandBuilder.Name method isn't used, the data is simply not displayed.
There are no clues that this field is required for the TreeList to function correctly and the API, found on page http://docs.telerik.com/kendo-ui/api/aspnet-mvc/Kendo.Mvc.UI.Fluent/TreeListColumnCommandBuilder, doesn't indicate this at all.
Since debugging the MVC razor implementation is a pain, it would be helpful if the documentation would be corrected to indicate that it is required and if an exception would be thrown when that method isn't called.
Thanks.