/**
  * Add the submenu item
  * @param string parent page slug
  */
 private function addSubMenu($parent_slug)
 {
     add_submenu_page($parent_slug, $this->post_type_repo->getSubmenuText($this->post_type), $this->post_type_repo->getSubmenuText($this->post_type), 'edit_posts', $this->post_type_repo->getMenuSlug($this->post_type), Listing::admin_menu($this->post_type->name));
 }
 /**
  * Add the primary top-level menu item
  * @param int counter
  */
 private function addMenu($c)
 {
     add_menu_page(__($this->post_type->labels->name), __($this->post_type->labels->name), $this->post_type->cap->edit_posts, $this->getSlug(), Listing::admin_menu($this->post_type->name), $this->menuIcon(), $this->menuPosition($c));
 }