iBooks Author: Open store links without leaving app?

Hi all,

This may be a simple question, but I can't seem to figure out what I am doing wrong. I am trying to link from within a book (created in iTunes Author) without leaving the iBooks app. I can add the iTunes link, but it opens the iTunes app.

There are other ebooks, including ones created in iBooks Author, that load the mini iTunes store pop-up panel when, and stay within the book that it open.

Any tips?

Thanks.