See the article "Making groups of Check Box Form Fields mutually exclusive
(so that they behave like radio buttons)" at:
http://www.word.mvps.org/FAQs/TblsFldsFms/ExclusiveFmFldChbxs.htm

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Hope this helps.
Please reply to the newsgroup unless you wish to avail yourself of my
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Doug Robbins - Word MVP
> How can I get option buttons to function on protected forms?