Additional Trigger for Lightbox Composition

Hi guys,
I would like to add a second trigger (button/text) to a lightbox composition in Muse. This however is not a available feature in Muse (you cannot duplicate or add a trigger). So I was thinking about accomplishing this by embedding a script with .mucow or  editing the lightbox script, but I couldn't find the code which displays the lightbox. Do you have any solution, or any idea where I should be start looking? Thanks alot!