Sorting by text is not supported as the data source will not have all the data (for more information you can check the related item in Kendo UI UserVoice
). Possible solution is shown in the following demo in our documentation:
Another option which is valid for the MVC wrappers is to add the custom field to the ViewModel and populate it either on the server side or on the client side after the data is loaded (e.g. DataBound event).
Check out the Telerik Platform - the only platform that combines a rich set of UI tools with powerful cloud services to develop web, hybrid and native mobile apps.