Joaquim Homrighausen mentioned this to Ron Tuynman:
 JH>   This has some weird side effects. If there are open MDI windows, they
 JH> "disappear" into thin air. I have no idea where they go, and they
 JH> immediately disappear from my Window menu, which normally lists all MDI
 JH> windows. Any idea why?
MDI children windows are very odd creatures and must conform to a lot of 
Microsoft-defined restrictions.  There's a lot they can't do.  For example, 
you can't hide one and you can't create one without showing it.  I would 
suggest, for your own sanity, that you work with them as-is.
                                ...Gary
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