I'm looking at this page http://demos.telerik.com/aspnet-mvc/grid/editing-custom
But there is no editor defined for this control columns.Bound(p => p.Category).ClientTemplate("#=Category.CategoryName#").Width(180);
It's just the client view template.
Is there a way you could add information to the demo around how the custom editor is working? I see there is a categories viewbag filled with the options but it is never called on the UI or used.