Views Fields: Additional Signup Info - Field Name

Have setup Additional Fields in the signup_form.inc and all works with the Signup Form. However, I cannot see the content of the field in the signup_user_vbo_admin_list view.

One additional field in the signup_form.inc:

...
 $days_options = array(
    'Working Saturday' => t('Saturday'),
    'Working Sunday' => t('Sunday'),
  );
}
  $form['signup_form_data']['dayswork']= array(
    '#type' => 'checkboxes',
    '#title' => t('What days can you work'),
    '#options' => $days_options,
    '#description' => t('Please select the days with you can work. If not working a full day, please indicate the day and time on the Additional Information line.'),
  );
....

Produces in the view:
Name: blahbla
AdditionalInformation:
dayswork: Array

How can I see what is in the dayswork and not 'Array'?

Thanks.
mlcc2000