fix

admin/main/submenu/item1/index.php

@@ -0,0 +1,18 @@
+<?php
+
+
+use Wt\Core\Admin\TableAdminPage;
+
+
+require_once($_SERVER['DOCUMENT_ROOT'].'/bitrix/modules/main/include/prolog_admin_before.php');
+
+
+CJSCore::Init('jquery');
+CAjax::Init();
+
+require($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/include/prolog_admin_after.php");
+
+$adminPage = new \Wt\Core\Admin\SiteSettingsAdminPage('bx.null', 'main.item1');
+$adminPage->render();
+
+require($_SERVER['DOCUMENT_ROOT'].'/bitrix/modules/main/include/epilog_admin.php');