I know how to do it with pre-ribbon versions, but not the ribbon. So I am useless when it comes to 2007. BTW, if you are restricting thing to some certain styles, then you should NOT allow manual formatting like bold, underline, italic.

That means they could bold Heading 1, or underline Heading 2. That does nit make sense.

Hopefully one of the people familiar with the Ribbon may know how to do a similar thing. I assume that it is possible.