Help needed with add-in code that tries to find the IDE 'Workspace' window.

I am trying to write a VC++ add-in that gathers all the function names
that appear in the Workspace window (Class view tab).

I have auto generated the add-in with help of the add-in wizard. I
have posted my code here but this generates an assertion error in
'...vc98\atl\include\atlbase.h' when run, not really surprising as I
have stumbled my way through this code.

I am finding it very difficult to find information on the subject -
any replies containing book titles/code samples/add-in info, etc would
be very useful. I have looked through the APPAUTO.H for the
IGenericWindow interface but there is no helpful info associated with
each function.

My code:

//Loop through all the windows to find the 'Workspace' window
    CComPtr<IDispatch> pGenericWindow;
    VERIFY_OK(m_pApplication->get_Windows(&pGenericWindow));

    CComQIPtr<IGenericWindow, &IID_IGenericWindow>
pGenWindow(pGenericWindow);

    bool ExitLoop=false;
    while (!ExitLoop)
    {
        BSTR Buf;
        //Get this window's title
        pGenWindow->get_Caption(&Buf);

        CString WindowTitle;
        WindowTitle=(char *)_bstr_t(Buf, FALSE);

        //Is this the "Workspace" window?
        if ( WindowTitle.Find("Workspace") != -1 )
            //exit loop
            ExitLoop=true;

        //Move on to the next window
        pGenWindow->get_Next(&pGenericWindow);
    }

Oh, and the workspace window is open when I run this code. Please
help!!