>>

>>CreateUserButtonText="Next" FinishCompleteButtonText="Create User"

>
>In general, a button should have a ValidationGroup attribute with the same value as the controls that will be validated when it is used to submit. You can have as many groups as you like using any name that you like. Don't know how this applies to your application though.
>Best,
>Viv

I tried to use the default CreateUserWizard control and it comes with the same problem.

Looks like I have to dig deep into this control... Microsoft documentation doesn't seem to be enough.