Cannot subclass Shell Embedding

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Has anyone encountered problems subclassing the "Shell Embedding"
window? I receive a failed assertion everytime I try to subclass it,
yet I have no problems subclassing its child window "Shell DocObjet
View". The assertion fails inside the line below [ wincore.cpp file,
CWnd::Attach() method ]:

ASSERT(FromHandlePermanent(hWndNew) == NULL);

hWndNew is the window handle of the "Shell Embedding" window.

Of course I would rather subclass "Shell Embedding" instead of "Shell
DocObject View" because the latter does not receive any of the moveTo()
and moveBy() notifications. Btw, I'm using MFC's CHtmlView, and
apparently I can subclass "Shell Embedding" with a release build.
However I prefer being able to debug my source code with Visual
Studio's debugger.

Many Thanks!

George

.

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