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Tab Order in VB .NET Windows Form

I have a Smart Device Application for a CE Device and whenever I hit Tab Order on the main Form I get an error 'Invalid Cast Exception'. The Form only has three buttons, a checkbox and a progress bar.
I don't know if it's related (perhaps my .NET Installation is screwed) but whenever I select help, I get a message saying 'Help is updating to reflect your recent changes. This may take several minutes.', followed by server execution failed.
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Bob Learned
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Yeah, this doesn't sound good.  I haven't seen this error before.  Did you just install something new?  How long has it been running without error?  Operating System (XP)?  Did you install XP Service Pack 2, and then it started crapping out?

Bob
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Mikal613
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Hi Bob,

It's windows 2000 Pro. I have installed some new stuff (unrelated to VB .NET) but I haven't tried the Tab Order so I don't know if these screwed it or not. I did re-install the MSDN which fixed the help problem.
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VFPSQLDeveloper

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Thanks Mikal613, it's not a huge app so re-arranging  InitializeComponent code works just fine.