How do I link text boxes in iBooks Author? I've been trying out iBooks author, and one thing i want to be able to do is to allow text overflow from one custom text box to another. In pages this is done either by clicking the blue little symbol in the lower-right part of a text box with too much text, and link it to another, or by going to the menu format->text box->add linked text box. In iBooks Author, however, this last option is greyed out for no apparent reason, and the blue link symbol never appears. Any suggestions?
Using the Botany sample, the text boxes seem to work as expected with the caveat that you have to intentionally click on one of the four corner handles of the text box to make the blue linking triangles appear.

I took a small video showing the controls reacting to mouse events.

From there, linking works as expected from the perspective of Pages.