std::for_each(fileInfoList.begin(), fileInfoList.end(), [this](const QFileInfo& fileInfo) {
        /* add tilesheet to our vector */
        int index = mTileSheets.add(fileInfo.absoluteFilePath().toStdString(), QSize(32, 32));

        /* add a new tab with scroll area */
        QWidget* tab = new QWidget(ui->tileSheetTabs);
        QRect tabViewRect = ui->tileSheetTabs->geometry();
        //tab->setLayout(new QGridLayout(tab));
        tab->setGeometry(tabViewRect);

        std::cout << std::to_string(tab->geometry().width()) << std::endl;
        std::cout << std::to_string(tab->geometry().height()) << std::endl;

        /* create a scroll area for this tilesheet */
	/********scroll area doesn't appear **********/
        QScrollArea* scrollArea = new QScrollArea(tab);
        QWidget* scrollAreaContents = new QWidget(scrollArea);
        scrollArea->setWidget(scrollAreaContents);
        scrollAreaContents->show();

        QRect tabRect = tab->geometry();
        scrollArea->setGeometry(tabRect);
        scrollAreaContents->setGeometry(tabRect);

        /* set scroll area's layout */
        this->setTileSelectLayout(scrollArea, scrollAreaContents, *(mTileSheets.get(index).get()));
        ui->tileSheetTabs->addTab(tab, QString(std::to_string(index).c_str()));

    });