printdialog error

"William JOYE" <[email protected]>
Newsgroups gmane.comp.mozilla.devel.xpcom
Organization Another Netscape Collabra Server User
Message-ID <[email protected]> 
Hello,

I would like to use my own printdialog box. I have found one in the
XPtoolkit (printdialog.xul & printdialog.js) but when I launch this xul file
I have the following error :
Error window.arguments[0].QueryInterface is not a function (line 366)

Someone can help to use the printdialog ?
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