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Create a lightbox from image gallery tab layout

I have an image gallery tab layout with the main tab content becomes the image in the thumbnail pane tab when selected. I would like the main content tab to turn into a light box which fills the entire screen when selected. How can I achieve this with my current setup? Please see site link below.

Here is my site Read-Only: [LINK][]
(how to share your site Read-Only link)

No replies to this yet? Just bumping this up.