if ($arID = $lAdmin->GroupAction()) {
    if ($_REQUEST['action_target'] == 'selected') {
        $rsData = CLearningGroup::GetList(array($by => $order), $arFilter);
        while ($arRes = $rsData->Fetch()) {
            $arID[] = $arRes['ID'];
        }
    }
    foreach ($arID as $ID) {
        if (strlen($ID) <= 0) {
            continue;
        }
        $ID = intval($ID);
        switch ($_REQUEST['action']) {
            case "delete":
                @set_time_limit(0);
                if (!CLearningGroup::delete($ID)) {
                    $lAdmin->AddGroupError(GetMessage("LEARNING_DELETE_ERROR"), $ID);
                }
                break;
        }
    }
}
// fetch data
$rsData = CLearningGroup::GetList(array($by => $order), $arFilter);
$rsData = new CAdminResult($rsData, $sTableID);
$rsData->NavStart();
// navigation string setup
$lAdmin->NavText($rsData->GetNavPrint(GetMessage("LEARNING_ADMIN_RESULTS")));
// list header
$lAdmin->AddHeaders(array(array("id" => "ID", "content" => "ID", "sort" => "id", "default" => true), array("id" => "ACTIVE", "content" => GetMessage('LEARNING_ADMIN_GROUPS_ACTIVE'), "sort" => "active", "default" => true), array("id" => "TITLE", "content" => GetMessage('LEARNING_ADMIN_GROUPS_TITLE'), "sort" => "title", "default" => true), array("id" => "CODE", "content" => GetMessage('LEARNING_ADMIN_GROUPS_CODE'), "sort" => "code", "default" => true), array("id" => "SORT", "content" => GetMessage('LEARNING_ADMIN_GROUPS_SORT'), "sort" => "sort", "default" => true), array("id" => "ACTIVE_FROM", "content" => GetMessage('LEARNING_ADMIN_GROUPS_ACTIVE_FROM'), "sort" => "active_from", "default" => true), array("id" => "ACTIVE_TO", "content" => GetMessage('LEARNING_ADMIN_GROUPS_ACTIVE_TO'), "sort" => "active_to", "default" => true), array("id" => "COURSE_LESSON_ID", "content" => GetMessage('LEARNING_ADMIN_GROUPS_COURSE_LESSON_ID'), "sort" => "course_lesson_id", "default" => true), array("id" => "COURSE_TITLE", "content" => GetMessage('LEARNING_ADMIN_GROUPS_COURSE_TITLE'), "sort" => "course_title", "default" => true)));
// building list