'Do a redirect if user presses the prev. step button. The rest of this
is super\'d from WizardView.'

def post(self, *args, **kwargs):

    wizard_goto_step = self.request.POST.get('wizard_goto_step', None)
    if (wizard_goto_step and (wizard_goto_step in self.get_form_list())):
        return self.render_goto_step(wizard_goto_step)
    return super(NamedUrlWizardView, self).post(*args, **kwargs)
