Thumbnail grid view and search features in BoxPreviewViewPager

I need to use Box Preview inside a fragment, so I made use of BoxPreviewViewPager. How do I get the controls like Thumbmnail Grid and Search here as well, just like in BoxPreviewActivity ?

Start by comparing the public capabilities of BoxPreviewViewPager with the controls available through BoxPreviewActivity. Trace how Thumbnail Grid and Search are exposed in the activity, then define how equivalent controls should be accessed when the pager is used inside a fragment; done means both controls work in that usage without requiring the activity.

Written by the indexing model from the issue text.