ContainerInterface.php

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<?php
namespace Magento\Backend\Block\Widget;

interface ContainerInterface extends \Magento\Backend\Block\Widget\Button\ContextInterface
{
    public function addButton($buttonId, $data, $level = 0, $sortOrder = 0, $region = 'toolbar');

    public function removeButton($buttonId);

    public function updateButton($buttonId, $key, $data);
}