Change icons of activities in Publisher 9.5 (value chain)

Hi all,



How can I change the icon of activities in a value chain in Publisher 9.5?



I have created three symbols derivates of the symbol of a value chain, to three macroprocesses.



When I publish my value chain in Publisher, when I go to the Activities link, my new symbols doesn't appear in the column "Icons". The original icons appear of the value chain, but my new symbols no.



How can change also, these icons for my icons?



I attached an screenshot of this problem.

Thank you very much in advance!

Greetings.