Some (actually, quite a long) time ago, I have filed a bug against
WinForms regarding exceptions when data-binding controls that are
within tab pages. The particular corner case is pretty obscure and it
will take a while to explain it, so I'll just refer you to the Connect
ticket for this - complete with description and repro code:
https://connect.microsoft.com/Visual...dbackID=351177
So far the response I've got is that it is actually "by design", and
the suggestion to "discuss issues like this in the forums". Well,
let's proceed with that then, shall we? I kindly ask a few moments of
your time to look at the ticket, decide if you believe that it is
indeed something that is "by design" (and known as such), or a honest-
to-God bug in WinForms, and vote (and/or comment in community
discussion) in the ticket accordingly.