Container.php

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<?php
namespace Magento\Ui\Component\Control;

use Magento\Framework\View\Element\AbstractBlock;
use Magento\Framework\View\Element\UiComponent\Control\ControlInterface;

class Container extends AbstractBlock
{
    const DEFAULT_CONTROL = \Magento\Ui\Component\Control\Button::class;
    const SPLIT_BUTTON = \Magento\Ui\Component\Control\SplitButton::class;

    protected function createButton($blockName, $blockClassName = null)
    {
        if (null === $blockClassName) {
            $blockClassName = static::DEFAULT_CONTROL;
        }

        return $this->getLayout()->createBlock($blockClassName, $blockName);
    }

    protected function _toHtml()
    {
        $item = $this->getButtonItem();
        $data = $item->getData();

        $contextPrefixName = $this->getData('context') ? ($this->getData('context')->getNameInLayout() . '-') : '';
        $block = $this->createButton(
            $contextPrefixName . $item->getId() . '-button',
            isset($data['class_name']) ? $data['class_name'] : null
        );
        $block->setData($data);
        return $block->toHtml();
    }
}