Can you please clarify what you mean under "user interface for a one-to-many relationship"?
Are you searching for an example where there is a form with Grid inside it and you want to pass the form data to the server? If yes, please check this Post grid data with form example. You could also find something useful in the GRID folder of the provided repository.
If you are searching for something else, I will need more details about the desired functionality.
Looking forward to your reply.
Get quickly onboarded and successful
with your Telerik and/or Kendo UI products with the Virtual Classroom free technical training, available to all active customers. Learn More.