RadzenButton ButtonType="ButtonType.Submit" missing

I'm trying to use the RadzenTemplateForm with the free Blazor components to take advantage of the validation messages.

I must be doing something very basic incorrectly because I cannot specify a Button as the ButtonType=submit to allow the validation messages to show.

When I type RadzenButton ButtonType="ButtonType.Submit" the ButtonType.Submit is highlighted with a message of ButtonType does not exist in the current context.

You need @using Radzen: