function sa_load_client_dash_addon()
{
    if (class_exists('SI_Client_Dashboard')) {
        return;
    }
    require_once 'inc/Client_Dashboard.php';
    require_once 'inc/Client_Dashboard_Notifications.php';
    SI_Client_Dashboard::init();
    Client_Dashboard_Notifications::init();
}
 public static function default_user_notification()
 {
     return SI_Client_Dashboard::load_addon_view_to_string('notifications/user-created', array(), true);
 }
<div id="si_dashboard">

	<?php 
if ($show_estimates) {
    print SI_Client_Dashboard::load_addon_view('section/dashboard-estimates', array('client_id' => $client_id, 'invoices' => $invoices, 'estimates' => $estimates), true);
}
?>

	<?php 
if ($show_invoices) {
    print SI_Client_Dashboard::load_addon_view('section/dashboard-invoices', array('client_id' => $client_id, 'invoices' => $invoices, 'estimates' => $estimates), true);
}
?>

</div><!-- #si_dashboard -->