Thank you for the code snippet, image, and details provided.
In order to achieve the desired behavior, I prepared a sample project with the needed implementation included.
Make the needed tests locally with the attached project and let me know if further assistance is needed.
Virtual Classroom, the free self-paced technical training that gets you up to speed with Telerik and Kendo UI products quickly just got a fresh new look + new and improved content including a brand new Blazor course! Check it out at https://learn.telerik.com/.