interop demo #3 -- MFC and WPF

Third demo is the one that uses MFC.  (What happened to #2, the DirectX demo?  I'm trying to figure out a way to post it, as far as I can tell the attachment is too big for this software.  We use CommunityServer on blogs.msdn.com, it has some nice features but I have to say I'm getting pretty fed up with its flakiness)

demo3.zip