dbx_page_advanced
dbx_page_advanced is an action that is fired when the page editing form is displayed and is related to dbx_page_sidebar.
Context:
File: /wp-admin/edit-page-form.php
<div id="ajax-response"></div>
</fieldset>
<?php do_action('dbx_page_advanced'); ?>
</div>
This hook is an action which means that it primarily acts as an event trigger, instead of a content filter. This is a semantic difference, but it will help you to remember what this hook does if you use it like this: add_action('dbx_page_advanced', 'your_function');
This hook was introduced in WordPress 2.0, and will not work in earlier versions.