X-Cart forums - Redirecting a customer to a custom page after registration

First of all let me start with general remarks about the webmaster mode.

To use the feature, we need to be logged in as an administrator. As a consequence, we can't use it to find out what goes on in the pages that customers who aren't logged in can see, which is the subject of this post.
Picking up template from the page disable clicking (which, of course, is necessary), thus it is impossible to picking up template from a pop-up window
Last but not least, it can be used only for customer section and not for admin section.

So here is my question. I would like to redirect a customer to a page of my choice,
instead of address book page, after registration. A search through this forum shows
that such a feature existed for XC4, e.g.

https://forum.x-cart.com/showthread.php?t=62989&highlight=registration
However, I haven't seen any post on the subject for XC5.

Now, for the reason I mentioned above, it is extremely difficult for me to figure out
which class is responsible for the redirection. However, I found this

Code:

    protected function getActionRegisterSuccessURL()

    {

        return array(

            'address_book',

            '',

            array('profile_id' => $this->getModelForm()->getProfileId(false)),

        );

    }

in /XLite/Controller/Customer/Profile.php.

So I made a class XLite/Module/VendorID/ModuleID/Customer/Profile.php with

Code:

<?php

namespace XLite\Module\CendorID\ModuleID\Controller\Customer;

class Profile extends \XLite\Controller\Profile

{

    protected function getActionRegisterSuccessURL()

    {

        return array(

            'mypage',

            '',

            array('profile_id' => $this->getModelForm()->getProfileId(false)),

        );

    }

}

but the customer is still redirected to the address book page after registration. What am I doing wrong here?