I need some help with hiding and unhiding text with VBA.

I have defined some bookmarks in a master document that a user can hide with
a macro that selects the bookmark then hides the selection by changing the
font to hidden.  I can't make an undo function as VBA can't select the hidden
bookmark.

Short of selecting the whole document and unhiding, can anyone suggest how I
can easily get around this?  Ie programatically select a hidden section of
text.

Thanks

plkijn