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Reacting to PAN and ZOOM ?


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I set the following reactor, to call Callback whenever user PANs then viewport:

(defun CallBack(event parameter)
   (If    (eq (car parameter) "VIEWCTR") (princ "Pan!") ) )

(if (not PanReactor)
  (setq PanReactor (vlr-sysvar-reactor nil '((:vlr-sysvarchanged . CallBack))) ) )


However it never writes "Pan!". It seems to me that changing "VIEWCTR" doesnt even reacts to the following reactor... so how to trap PAN and ZOOM actions?

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