Leaderboard

Another method: (defun c:vpon ( / d s ) (vl-load-com) (if (setq s (ssget "_+.:S:E:L" '((0 . "VIEWPORT")))) (progn (setq d (vla-get-activedocument (vlax-get-acad-object))) (vla-put-mspace d :vlax-true) (vla-put-activeviewport d (vlax-ename->vla-object (ssname s 0))) ) ) (princ) ) And to 'deactivate': (defun c:vpoff ( ) (vla-put-mspace (vla-get-activedocument (vlax-get-acad-object)) :vlax-false) (princ) )