   table entry count
  Call PatchVal(OFFSET_P4, AddrMsgTbl())                  'Patch the address of
   the Before message table. We need do this because there's no guarantee that
   the table existed at SubClass time, the table only gets created if a
   specific message number is added.
End Sub

'Arbitarily call the DefWindowProc - Normally, if bHandled isn't set in the
 WndProc callback, the DefWindowProc
'is called in the assembler thunk after the callback. Use this method to call
 the DefWindowProc firs