types.php

См. документацию.

<?php
 
namespace Bitrix\Main\Grid\Panel;
 
use ReflectionClass;

class Types
{
    public const DROPDOWN = 'DROPDOWN';
    public const CHECKBOX = 'CHECKBOX';
    public const TEXT = 'TEXT';
    public const BUTTON = 'BUTTON';
    public const LINK = 'LINK';
    public const CUSTOM = 'CUSTOM';
    public const HIDDEN = 'HIDDEN';
    public const DATE = 'DATE';

    public static function getList()
    {
        $reflection = new ReflectionClass(__CLASS__);
 
        return $reflection->getConstants();
    }
}