12/2/2013 12:40:48 PM
The easiest way to do it is to enable a feature that PivotViewer CXML files support (found out about it only recently), that is Links (zero or more) per item. They put a label Related Galleries above those links (could change that with some hacking on the visual tree at runtime or by retemplating the PivotViewer control [I avoid retemplating usually in case a newer version comes out with an improved template that I'd have to change again]). They are shown at the bottom of the Details pane of an item.
So could have the user enter any related links they wish, with some of them being for the videos used in the activity (that is give URLs of the style http://gallery.clipflair.net/video/...). Will see into adding that stuff in the metadata and related UI to the metadata forms (to enter one ore more links)