'This method gets called when the current step has to be changed.
`goto_step` contains the requested step to go to.'

def render_goto_step(self, goto_step, **kwargs):

    self.storage.current_step = goto_step
    form = self.get_form(data=self.storage.get_step_data(self.steps.current), files=self.storage.get_step_files(self.steps.current))
    return self.render(form)
