My registration page is using a `register.phtml` located under certain path, which I know. But I don't know where the associated xml layout file is located, because it was already defined and I didn't do it.

But I want to use another `.phtml` file. My problem is that I am not able to find which layout is defining the `.phtml` that will be used. Or at least, the one it's supposed to be seems not to be the one that's being used.

I have been trying without success to obtain the layout that's being used. I tried using 

```
<?php echo $this->getLayout()->getBlock('customer_form_register')->getXml(); ?>

```

and some similar things, but without success. I already activated from the admin the path and block hints.

I need to know which layout is defining the used `register.phtml`. Any help is much appreciated.