Newbie trying to pass xml object

Let me start by saying that I am very new to php and cakephp. I went
through the blog tutorial (:-)) and now am facing a problem which I
believe is something simple, but can't seem to get it to work. I have
an xml file which I am reading into my view then upon selection of one
of the nodes, call my controller to display the children of that
node. Here are my code snippets:

In my view:

<?php
$registryFile = simplexml_load_file("../models/registry.xml");
$modules = $registryFile->modules;
foreach($modules->children() as $module)
{
$links = $module->links;
echo $this->Html->link($module-
>name,array('action'=>'Modules','$links'));
echo "<br/>";
}
?>

In my controller:

class MyController extends AppController {
function Modules($InParent)
{
echo "<dt>".$InParent."</dt>";
foreach($InParent->children() as $link)
{
echo "<dd>".$link->name."</dd>";
}
}
}

I keep getting an error that "Fatal error: Call to a member function
children() on a non-object".
Any assistance is appreciated.

Thanks. Mocha Man

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