$tabs = self::get_tabs();
		if ( isset( $tabs[ $endpoint ] ) && ! empty( $tabs[ $endpoint ]['endpoint'] ) ) {
			return true;
		}

		return false;

	}

	/**
	 * Handle modification of the default dashboard title for certain pages and sub pages
	 *
	 * @param    string $title  default title HTML
	 * @return   string
	 * @since    3.24.0
	 * @version  3.24.0
	 */
	public function modify_dashboard_title( $title ) {

		global $wp_query;
		$tab = self::get_current_tab( 'tab' );

		if ( 'my-grades' === $tab && ! empty( $wp_query->query['my-grades'] ) ) {

			$course = get_posts(
				array(
					'name'      => $wp_query->query['my-grades'],
					'post_type' => 'course',
				)