' Look for main menu close.
Public Function NewWindowProc(ByVal hwnd As Long, ByVal msg _
    As Long, ByVal wParam As Long, ByVal lParam As Long) As _
    Long
Const WM_NCDESTROY = &H82
Const WM_MENUSELECT As Long = &H11F
Const WM_EXITMENULOOP As Long = &H212

    ' Load the message names.
    LoadMsgNames

    If msg = WM_EXITMENULOOP Then Debug.Print Hex$(msg) & _
        ": " & MsgName(msg)

    ' If we're being destroyed,
    ' restore the original WindowProc.
    If msg = WM_NCDESTROY Then
        SetWindowLong _
            hwnd, GWL_WNDPROC, _
            OldWindowProc
    End If

    NewWindowProc = CallWindowProc( _
        OldWindowProc, hwnd, msg, wParam, _
        lParam)
End Function