public function aaron_feed_meta_box()
    {
        $args = array('url' => $this->_feed_url, 'items' => '5');
        echo '<div class="rss-widget">';
        wp_widget_rss_output($args);
        echo "</div>";
    }
    public function screen_icon_link($name = 'aaron')
    {
        $link = '<a href="http://aarondcampbell.com">';
        if (function_exists('get_screen_icon')) {
            $link .= get_screen_icon($name);
        } else {
            ob_start();
            screen_icon($name);
            $link .= ob_get_clean();
        }
        $link .= '</a>';
        echo apply_filters('rpf-screen_icon_link', $link, $name);
    }
    public function admin_print_scripts()
    {
        if (isset($_GET['page']) && $_GET['page'] == $this->_hook) {
            wp_enqueue_script('postbox');
            wp_enqueue_script('dashboard');
        }
    }
}
// Instantiate our class
$wpTwitterWidget = wpTwitterWidget::getInstance();
 public function widget($args, $instance)
 {
     $instance = $this->_getInstanceSettings($instance);
     $wpTwitterWidget = wpTwitterWidget::getInstance();
     echo $wpTwitterWidget->display(wp_parse_args($instance, $args));
 }