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>Right now, I have control of the HTML, and it IS a submit button. But this is a testing environment only. The real deal I won't have access to the HTML. I've even tried the _webbrowser4 control from the _webview.vcx and that still doesn't fire the BeforeNavigate2 method either.

Can you post the HTML? Something doesn't sound right - if it's navigating to a new page, BeforeNavigate2 should definitely fire.