MainWindow::MainWindow()
{
    QSpreadsheetHeaderView *hv = new QSpreadsheetHeaderView(Qt::Horizontal, this);
    hv->setClickable(true);
    hv->setHighlightSections(true);
    TableModel *model = new TableModel(this);
    QTableView *tv = new QTableView(this);
    tv->setModel(model);
    tv->setHorizontalHeader(hv);

    setCentralWidget(tv);
}