Show Xprofile Fields in the Members Page

Hello I would like to display a few Xprofile Members fields in the Members Directory. For example I have a First Name and Last Name profile fields, but only the First Name appears. Is there there a way or code to do suck thing? I have tried this code at the bp-custom.php but no luck. Kind Reards Stratos A. function my_directory() { if ( bp_is_active( 'xprofile' ) ) if ( $memberfax = xprofile_get_field_data( 'Επώνυμο', bp_get_member_user_id() ) ) : echo '<br/>'; echo $memberfax; echo ''; endif; } add_filter ( 'bp_directory_members_item', 'my_directory' );