zoom to object

[Anonymous]

Hello members of the forum.

My question: Selection set "C" works when using zoom to objects (in contrast to using selection set "X").

Why doesn't it work when I run the code? (command "_.zoom" "C" ins 10).

However , when I added "alert" to the command, everything works fine.

(defun C:BR (); = Break Objects At Blocks [Line, Polyline, Arc, Xline, Ray, open Ellipse or Spline]
  (vl-load-com)
  (command "_.zoom" "extents")
  (setq osmode (getvar "osmode"))
  (setq cmdecho (getvar "cmdecho"))
  (setvar "osmode" 0) 
  (setvar "cmdecho" 0)
  (if (setq blkss (ssget "X" '((0 . "INSERT"))))
   (progn
    (repeat (setq n (sslength blkss))
      (setq ins (cdr (assoc 10 (entget (ssname blkss (setq n (1- n)))))))
;;;      (alert " zoom C")
      (command "_.zoom" "C" ins 10)
      (if
        (and
          (setq entss (ssget "_C" ins ins '((0 . "*LINE,*POLYLINE,ARC,ELLIPSE,RAY"))))
          (setq
            ent (ssname entss 0)
            etype (cdr (assoc 0 (entget ent)))
          ); setq
          (/= etype "MLINE"); [can't be broken]
          (if (wcmatch etype "SPLINE,ELLIPSE") (not (vlax-curve-isClosed ent)) T); no single-point Break
        ); and
          (command "_.break" ent ins ins)
       ); if
    ); repeat
   );; progn
  ); if
);; defun

Thanks