Extending CI_Controller is not working

[eluser]MartinF[/eluser]
Hello,

i am using CodeIgniter 2.0.

I have a base controller class ControllerBase (ControllerBase.php) that extends the CI_Controller.
I have put this in the application/libraries folder.

Code:

class ControllerBase extends CI_Controller
{
    var $_layout;

    function __construct($layout = 'shared/_layout')
    {
        parent::__construct();
        $this->_layout = $layout;
    }

    function setLayout($layout)
    {
        $this->_layout = $layout;
    }

    function loadLayoutView($view, $title = "", $data = null, $return = false)
    {      
        $data['title'] = $title;
        $data['view'] = $this->load->view($view, $data, true);

        return $this->load->view($this->_layout, $data, $return);
    }
}

The idea is that i usually want this to be the class that all my Controllers extends, and I can put all shared functions in only one place.

But whenever i try to extend this class (ControllerBase) from one of my Controllers (in application/controllers) i get an error saying "Fatal error: Class 'ControllerBase' not found in......"

Code:

class Home extends ControllerBase
{
    function __construct()
    {
        parent::__construct();
    }

    function index()
    {
        $this->loadLayoutView('home/index', 'Home');
    }
}

I have registered ControllerBase in the autoload.php

Code:

$autoload['libraries'] = array('ControllerBase');

The file is being loaded - if i try to echo out something at the top of the file and i dont try to extend it.

I have also tried naming the file with the MY_ prefix but it doesnt make a difference, I still get the error message when i try to extend the class.

It works fine if I put the ControllerBase class in the same file as the Home class

So i suspect it has something to do with the autoloading happening to late in the proccess (after the Home class tries to extend the ControllerBase), or maybe the naming of the file?

I assume application/libraries is the correct place to put the file?

Anyone who can figure out what i am doing wrong ?