function rex_externalMultiValueManager(&$formField, $foreignTable, $foreignField)
 {
     parent::rex_multiValueManager($formField);
     $this->foreignTable = $foreignTable;
     $this->foreignField = $foreignField;
 }
 function rex_internalMultiValueManager(&$formField, $value_separator = '||')
 {
     parent::rex_multiValueManager($formField);
     $this->setValueSeparator($value_separator);
 }