Container.php

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

use Magento\Backend\Block\Widget\Button\ContextInterface;

class Container extends \Magento\Framework\View\Element\AbstractBlock
{
    protected function createButton($blockName, $blockClassName = null)
    {
        if (null === $blockClassName) {
            $blockClassName = \Magento\Backend\Block\Widget\Button::class;
        }
        return $this->getLayout()->createBlock($blockClassName, $blockName);
    }

    protected function _toHtml()
    {
        $item = $this->getButtonItem();
        $context = $this->getContext();

        if ($item && $context && $context->canRender($item)) {
            $data = $item->getData();
            $blockClassName = isset($data['class_name']) ? $data['class_name'] : null;
            $buttonName = $this->getContext()->getNameInLayout() . '-' . $item->getId() . '-button';
            $block = $this->createButton($buttonName, $blockClassName);
            $block->setData($data);
            return $block->toHtml();
        }
        return parent::_toHtml();
    }
}