DialogWithForm

Having a form inside the Dialog its quite simple, you simply add a <form> element between DialogSurface and DialogBody to ensure all the content between them are properly wrapped inside the formulary. This allows a button inside DialogActions to be properly used as submission button.

Keep in mind that controlling the open state of the Dialog might be ideal in this scenario, since validation and submission are possibly synchronous activities. For example, closing the Dialog only after the submission is successful would require control of the open state, to properly set open to false only once the submission has succeeded.