TonyJ,
Here are some links to ActiveX tutorials and example code in TestStand and CVI:
http://digital.ni.com/public.nsf/websearch/C4ABFFC75C5E6A7186256C4B0083BF3C?OpenDocument
http://zone.ni.com/devzone/cda/tut/p/id/2984
http://zone.ni.com/devzone/cda/tut/p/id/2981
http://zone.ni.com/devzone/cda/tut/p/id/2982
http://www.developer.com/net/vb/article.php/1539541
http://digital.ni.com/public.nsf/websearch/610540BB3EA4EBDD862568960055E498?OpenDocument
http://zone.ni.com/devzone/cda/tut/p/id/4978
http://zone.ni.com/devzone/cda/epd/p/id/1987
Test Engineer - CTA