If I got program contained with "VLAX-GET-ACAD-OBJECT",the Computer always said "; error: no function definition: VLAX-GET-ACAD-OBJECT",can anybody explain to me how to understand it Best regards Ade Suharna (if *Select (vla-clear *Select) (setq ssColl (vla-get-SelectionSets (vla-get-ActiveDocument (vlax-get-acad-object))) *Select (vla-add ssColl "sel") ) ) (setq ss (ssget)) (if SS (progn (vla-Select *Select acSelectionSetPrevious) (vlax-for % *Select (vla-copy %) ) ) ) ) _$