Trigger Order for Closing Lightboxes.

This has GOT to be simple, and I have GOT to be missing something....

I have a slide - you can either click "Next" and go to Slide X, or click on a shape to activate a Lightbox (with navigation controls).

If they choose the Lightbox option, I need the learner to go to another lightbox, and then for the Navigation controls to shut all Lightboxes, and return to Slide X.

Can't figure it out. SL just keeps everything in Lightbox mode.

Probably end-of-day-'itus, and would appreciate some help please!

Here's the current Trigger sequence on the  2nd lightbox:

Thanks

Bruce