Disabling filling form with old values on validation failure

I have a situation where the old form values are absolutely NOT helpful in any way after a validation failure; I cannot find a way to prevent tapestry from autofilling the old form values.

Is this a possibility or am I going to have to subclass the validation tracker implementation to provide value clearing? I do not want to clear the whole tracker because I want to form to be in error, but I do not want the old input in the form fields.

Thanks!