CadFrank, 
change your code as follows: 
  
- (defun c:test (/ _test Id)(defun _test (typ) (cond  ((= Typ "Long")   (start_list "list_1")   (mapcar 'add_list longueur1)   (end_list)   (start_list "list_2")   (mapcar 'add_list longueur1)   (end_list)  )  ((= Typ "Surf")   (start_list "list_1")   (mapcar 'add_list surface1)   (end_list)   (start_list "list_2")   (mapcar 'add_list surface1)   (end_list)  ) ))(setq longueur1 '(" " "[m] Mètre" "[km] Kilomètre" "[pi] Pied" "[po] Pouce"))(setq surface1 '(" " "[km²] Kilomètre carrée" "[m²] Mètre carrée" "[pi²] Pied carrée" "[po²] Pouce carrée"))(setq Id (load_dialog "X:\\Documents\\AutoCAD\\Support\\TEST.dcl"))(if (not (new_dialog "bienvenue" Id)) (exit))(action_tile "rb1" "(_test "Long")")(action_tile "rb2" "(_test "Surf")")(action_tile "rb3" "(_test "Vol")")(action_tile "rb4" "(_test "Poid")")(action_tile "rb5" "(_test "Force")")(action_tile "rb6" "(_test "Pres")")(action_tile "rb7" "(_test "Mom")")(action_tile "Close" "(done_dialog) (setq userclick nil)")(start_dialog)(unload_dialog id) (princ))
 
 
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