ChildTab.php

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<?php
namespace Magento\Catalog\Block\Adminhtml\Product\Edit\Tab;

class ChildTab extends \Magento\Backend\Block\Template
{
    protected $tab;

    public function setTab(\Magento\Backend\Block\Widget\Tab\TabInterface $tab)
    {
        $this->tab = $tab;
        return $this;
    }

    public function getTitle()
    {
        return $this->tab->getTabTitle();
    }

    public function getContent()
    {
        return $this->tab->toHtml();
    }

    public function getTabId()
    {
        return $this->tab->getTabId();
    }

    public function isTabOpened()
    {
        return (bool)$this->tab->getData('opened');
    }
}