$self->mode_param(\&which_state);
$self->{DISPATCH_SUBMIT} = {
   'state_main' => {
      ' Create new question ' => 'state_new_question',
      ' View all questions ' => 'state_view_all',
   },
   'state_new_question' => {
      'Add question' => 'state_add_question',
      'Cancel'       => 'state_main',
   }
}