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From: John Braham on 11 Sep 2006 06:03
I hope someone can hep with this!

I have a winform (VB.NET 2005), containing a tab control, which in
turn contains a few standard controls and one custom control, the form
used to work fine, then today for no apparent reason when I try to load
the designer for the form I am given a message box saying that the tab
control has thrown an unhandled exception and has been disabled:

Operation unavailable (Exception from HRESULT: 0x800401E3
(MK_E_UNAVAILABLE))

Then of course the designer won't load,

any suggestions please?

Thanks,
John Braham

From: Robinson on 11 Sep 2006 08:48

"John Braham" <john_braham(a)hotmail.com> wrote in message
news:1157969010.547716.221080(a)e3g2000cwe.googlegroups.com...
>I hope someone can hep with this!
>
> I have a winform (VB.NET 2005), containing a tab control, which in
> turn contains a few standard controls and one custom control, the form
> used to work fine, then today for no apparent reason when I try to load
> the designer for the form I am given a message box saying that the tab
> control has thrown an unhandled exception and has been disabled:
>
> Operation unavailable (Exception from HRESULT: 0x800401E3
> (MK_E_UNAVAILABLE))
>
> Then of course the designer won't load,
>
> any suggestions please?
>
> Thanks,
> John Braham
>

What is the custom control? If it's one of your controls, create a new form
and drag/drop the user control onto it to see if it's that causing the
problem.


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