Careful with that “Remove Tab” option on Visual Studio’s TabPane control — it removes the current TabPage and all controls on it without any sort of warning or confirmation. Edit -> Undo will restore the TabPage, but not any buttons or other controls which were on it. That’s more than a bit sucky. Something so drastic ought to either have a 100% undo option or a confirmation/warning.
Good thing I have a fairly recent version in SubVersion.