buttonlocation.php

См. документацию.

<?
 
namespace Bitrix\UI\Toolbar;
 
abstract class ButtonLocation
{
    const AFTER_TITLE        = "after_title";
    const RIGHT                = "right";
    const AFTER_FILTER      = "after_filter";
    const AFTER_NAVIGATION  = "after_navigation";
    const FILTER_RIGHT = self::AFTER_FILTER;
}