In excel 2007 I usually protect formulas from being overwritten by users by
selectively locking calculated cells, and then protecting the worksheet.
However, I sometimes need users to be able to use the Group toggle switch to
show or hide various groups of columns, and it appears that protecting the
sheet disables the ability to use Group toggle switches.

Is there a way to protect formulas from being overwriten without protecting
the worksheet itself, perhaps by using some fancy validation formulas?
--
JM