[plt-scheme] mysterx InternetExplorer.Application NewWindow2

I'm trying to monitor the URLs visited by Internet Explorer.
Here's my test.

(require (lib "mysterx.ss" "mysterx"))
(define ie (cci/progid "InternetExplorer.Application"))
(com-set-property! ie "Visible" #t)
(com-invoke ie "Navigate" "http://hci.ucsd.edu")
(com-register-event-handler ie "DocumentComplete" (lambda(doc url) (printf 
"~a~%" url)))
(com-register-event-handler ie "NewWindow2" (lambda(ie nav?) (printf 
"new~%")))

I get Navigate events from the main window, but I never get a NewWindow2
event, so I can't attach to the new window to monitor it.

Hints?

Thanks,

Ron
stanonik at cogsci.ucsd.edu