BlazorTabControlVideo

This is an extension of David Eggenberger's work to get TabPanels to work how I wanted. It has not been ported to MudBlazor.

David's excellent work is here: https://github.com/DavidEggenberger/DavidSeesSharp-Videos/tree/main

I'm only posting so some people can figure out what I did from here: MudBlazor/MudBlazor#7010

Craig