function __construct($plugin_slug)
 {
     $this->plugin_slug = $plugin_slug;
     add_filter($this->plugin_slug . '_option_tabs', array($this, 'add_options_tab'), 15);
     add_action('admin_init', array($this, 'initialize_category_mapping_options'));
     parent::__construct($plugin_slug);
 }
 function __construct($plugin_slug)
 {
     $this->plugin_slug = $plugin_slug;
     //add_filter($this->plugin_slug . '_option_tabs', array($this, 'add_options_tab'), 1);
     $this->plugin_options = WC_Pricefiles()->get_options();
     add_action('admin_menu', array($this, 'add_plugin_menu'));
     add_action('admin_enqueue_scripts', array($this, 'admin_options_styles'));
     add_action('admin_init', array($this, 'initialize_pricefile_options'));
     require_once dirname(WC_PLUGIN_FILE) . '/includes/wc-template-functions.php';
     parent::__construct($plugin_slug);
 }