FormBuilder -- add header options to auto-linked select menus

Hi -- I think this is simple but I'm not sure how to do it. When you make a linked field in a formBuilder form through the database.links.ini file, eg, [mc_SPs] ethnicity_id = mc_val_Ethnicities:ethnicity_id how do you add options to this field (eg a header option like "Select Ethnicity"). I know how to add options when just using quickform -- $quickForm =& new HTML_QuickForm_select($selectNameField, $selMenuInfo['LABEL']); $quickForm->addOption( $selMenuInfo['HEADER_TEXT'], ''); -- but not on these auto-linked fields. Can someone post an example or explanation? Much appreciated, Sarah