I am trying to implement Dashboard widget class (found here: http://harpanet.com/programming/php/codeigniter/dashboard/index#installation) but it is giving me error Unable to load the requested class

I have tried to add this class in autoload as well as menually to my controller $this->load->library('dash') but this also giving the same error.

I have checked dash.php and found below method private function __example__() but can't understand what the developer is saying in comment.

class Dash
{
    private function __example__()
    {
        /*
         * This function is purely to show an example of a dashboard method to place
         * within your own controller.
         */

        // load third_party hArpanet dashboard library
        $this->load->add_package_path(APPPATH.'third_party/hArpanet/hDash/');
        $dash =& $this->load->library('dash');
        $this->load->remove_package_path(APPPATH.'third_party/hArpanet/hDash/');

        // configure dashboard widgets - format: type, src, title, cols, alt (for images)
        $dash->widgets = array(

                    array('type'=>'oop',     'src'=>'test_dash',         'title'=>'Test OOP Widget',    'cols'=>3),

                    // if 'title' is set to FALSE, the title block is omitted entirely
                    // note: this is an 'html' widget but is being fed content from a local method
                    array('type'=>'html',     'src'=>self::test_method(), 'title'=>false,    'cols'=>3),

                    array('type'=>'file',     'src'=>'saf_inv.htm',         'title'=>'Safety Investigation'),

                    // multi-content widget - set widget title in outer array (also note use of CI anchor to create a link)
                    array('title'=>anchor('tz', 'TARGET ZERO'),
                            // sub-content follows same array format as single content widget
                            // 'img' content can also have an 'alt' text
                            array('type'=>'img',    'src'=>'saf_tzout.gif',      'alt'=>'Action Completed'),
                            array('type'=>'file',    'src'=>'saf_tz.htm'),
                            array('type'=>'file',    'src'=>'ave_close.htm',     'title'=>'Average Time to Close')
                            ),

                    array('type'=>'file',    'src'=>'saf_meet.htm',        'title'=>'Safety Meeting'),
                    array('type'=>'file',    'src'=>'saf_acc.htm',        'title'=>'Accident Investigation'),
                    array('type'=>'file',    'src'=>'saf_hazmat.htm',     'title'=>anchor('hazmat', 'HAZMAT')),
                    array('type'=>'file',    'src'=>'saf_cont.htm',         'title'=>'Loss of Containment'),
                    array('type'=>'file',    'src'=>'saf_worksinfo.htm',    'title'=>'Works Information'),

                    // an action widget - 'clear' will generate a blank widget with a style of clear:both
                    array('type'=>'clear'),

                    // multi-content widget - width can be set using the 'cols' param in outer array
                    array('title'=>'RAG Report', 'cols' => 2,

                            array('type'=>'file',    'src'=>'saf_rag.htm'),
                            array('type'=>'img',    'src'=>'ProcSaf.gif')),

                    array('type'=>'file',    'src'=>'saf_chrom.htm',        'title'=>'Chrome checks'),
                );

        // populate the view variable
        $widgets = $dash->build('safety');

        // render the dashboard
        $this->load->view('layout_default', $widgets);

    }
...................

} // end of Dash class

Installation path is root/application/third_party/hArpanet/hDash/libraries/dash.php

How can I load this class to my system and use widgets?