turn on the DOCHOSTUIFLAG_ENABLE_FORMS_AUTOCOMPLETE flag in your IDocHostUIHandler::GetHostInfo implementation. Due to a bug in .Net's WebBrowser class, you can not customize its IDocHostUIHandler implementation. You need to use the Microsoft Web Browser ActiveX by yourself and implement this interface on its control site.
Also worth mentioning is that the this has nothing to do with Windows Form Designer, the topic of this forum.
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