How to handle Explorer_TridentDlgFrame window in vb.net

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VB

I am working on a winforms project that does some automation of IE
using the IE object model. At some point a button is clicked in the current
IE instance that call the window.showModalDialog javascript method, thus
popping up a dialog window. This window is not of the InternetExplorer type
though, it is a Internet Explorer_TridentDlgFrame, so I have no idea how to
get a usable handle to it. I've looking for some sort of collection off of
the InternetExplorer and htmlDocument objects and have come up empty. Does
anyone have any ideas?

Thanks for any help.