function buildQuickForm()
{
$contributionIds = implode(',', $this->_contributionIds);
$this->setContactIDs();
$this->add('text', 'contactId', ts('CiviCRM ID', array('domain' => 'de.systopia.donrec')), null, $required = true);
$this->add('hidden', 'contributionIds', $contributionIds);
// call the (overwritten) Form's method, so the continue button is on the right...
CRM_Core_Form::addDefaultButtons(ts('Rebook', array('domain' => 'de.systopia.donrec')));
parent::buildQuickForm();
}
