Extending Controller from a Master Controller

[eluser]Mavrick[/eluser]
Hi every one,

I have created a Master Controller. And I want my other controller's to extend my Master controller. I did tried that but no luck. Is there a way of doing it???

Let me put my Master Controller here:

Code:

<?php
    class Master extends CI_Controller {
        function __construct() {
            parent::__construct();
            $this->load->helper('url');
            $this->load->view('header');
        }
    }
?>

Now What I tried was :

Code:

class My_controller extends Master {....}

But it didn't worked... Can some one tell me a way to this kind of a thing? If its possible

Thanks in advance,