I am confused about your demos. Why do you not use the Telerik Blazor components as much as possible. For instance, if you look at the window demo, the only Telerik compenents I see is the TelerkWindow and items directly related to it. For textboxes and labels, you go back to standard HTML instead of using the your equivalent. Do they not play well together, or is there some other reason you don't use them?
I am asking as an honest question. I am just now getting into this stuff and trying to figure out where I am going wrong when I run into problems is a pain. For instance, This code ends up showing nothing. When I inspect it, it is one the page with dimensions of 0x17. I don't know if it is because of something I've done wrong with the WIndow, the textboxes, or if it is something else.