What Vector Multipage demo are you referring to? Anyway, look at the TiffHandler demo in the ..Demos\InputOutput\TiffHandler folder for a demo on how to add tags to a Tiff file.
The example is in the folder demos. I need is to insert comments, lines, squares, etc., and not change the tags file. I need to insert these elements in all pictures TIFF file in all your pages. Could understand me?