function results_html($search_term, $num_results = null)
 {
     $_GET['tab'] = 'search';
     $GLOBALS['hook_suffix'] = 'foo';
     $_REQUEST['s'] = $search_term;
     parent::__construct();
     ob_start();
     $this->prepare_items();
     $num_results = intval($num_results) ? intval($num_results) : apply_filters('omnisearch_num_results', 5);
     $this->items = array_slice($this->items, 0, $num_results);
     remove_action('install_plugins_table_header', 'install_search_form');
     $this->display();
     $html = ob_get_clean();
     return $html;
 }
 function get_columns()
 {
     $columns = parent::get_columns();
     $columns['source'] = __('Source', 'installer');
     $columns['price'] = __('Price', 'installer');
     return $columns;
 }