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extendPageType For Nested Pages

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Hi,

I've been trying to prevent nested pages based upon Jordan's tutorial on:
http://c5cookbook.com/recipes/prevent_nested_pages...

However the on_page_add function doesn't seem to be working. For example, I've tried adding a table entry as a test:

In site_events.php:
<?php
Events::extendPageType('page', 'on_page_add');
?>


In controllers/page_types/page.php:
<?php 
defined('C5_EXECUTE') or die(_("Access Denied."));
class on_page_add extends Controller {
   function on_page_add() {
      $ql = "INSERT INTO testtable (cid)
           VALUES (955)";
      mysql_query($ql);
   }
}
?>


I've run this test a few different ways and it doesn't seem to create any entry in the database. (Concrete 5.4.1.1)

(Alternatively, running:
Events::extend($event, $class, $method, $filename, $param);

Seems to work, just how to pass the $page variable to find the parent page's cID.)

Anyone got any ideas why this is failing for extendPageType?