Form.Show and events

I have an app that seems to behave differently (possibly) after
installing VS2008 and .Net 3.5

=20

Suddenly the event handler for combo boxes (SelectedItemChanged) is
getting called when Show() is called rather than when the combo item is
set prior to showing the form.   Could something have changed in .Net to
cause this behaviour. This worked fine in a previous release of my
application some months ago and no code has changed.

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