Open related resource from action in a repeater

Hi!
I'm trying to open a new tab with the related records by clicking on the an extraItemActions on Repeater.

I have Course->Sections->Page hierarchy.

I have added Section in CourseResource as a Repeater. Then added an extraItemAction on it. I want to open the Table of Pages that relates only to the Section..

Could someone please point me in the right direction on how to do this?