I wonder if you have a sample that use a component that act like the Bootstrap Radio Toogle button (Checks and radios · Bootstrap v5.1) eg. something like your RadzenToggleButton but mutual exclusive if there are more than one in a group
I don't know if it easier to start with radio buttons and change the aspect with css, or use more togglebuttons that listens their sibilings and turn on/off
BTW. in your component guide (Welcome to Radzen.Blazor!) the togglebutton is missing.