TabBook/TabPage Problems

My first question is how do you delete a page from a tabbook?

I'm trying to do this:

%tabBook.remove(%tabPage);

This is what is meant to work, as far as I am aware, for removing a page, since you add a page to a book using:

%tabBook.add(%tabPage);

The problem I *think* that I am having is that the TabBook's "onChildRemove" callback (source) is not being called when the page is meant to be removed.

Am I doing anything wrong? Does anyone know a solution?

Cheers