I wouldn't be using a userform for this (although you could if you wanted).

If you want to 'grey out' a section you could do this by:
Bookmark the section you want to grey
Create a character style that has the grey attribute you want to apply
Create a macro that applies this character style to the bookmarked range
Add a macro to the ThisDocument module of the template to check the status of a CC when you exit it. This macro could be used to trigger the character style macro.

This is not something that can be recorded although elements of it can be.

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Andrew Lockton
Chrysalis Design, Melbourne Australia