Need Help Customizing CFileDialog

I am trying to modify the CFileDialog. I have read and followed the example in
“Inside Visual C++” by David Kruglinski, and it has gotten me pretty far along. But what I’m trying to do is add a ComboBox to the dialog that will control the file type ComboBox. So that when a user selects something out of the new ComboBox the file type ComboBox will be updated. I have tried changing the m_strFilter and the m_ofn.lpstrFilter members with no luck. Any pointers that ya’ll can suggest would be greatly appreciated.

Thanks,

Al