Reopen the MainWindow

[thibs]

Hi guys! I was trying to show mainwindow after to hide that, but I couldn`t do that.

First I hide the mainwindow in the pushbutton action and open a dialog window:

void MainWindow::on_NewTest_clicked()
{
    this->hide();
    NewTest newtest;
    newtest.setModal(true);
    newtest.exec();
 
}

void MainWindow::on_NewTest_clicked()
{
    this->hide();
    NewTest newtest;
    newtest.setModal(true);
    newtest.exec();

}

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Then in this dialog window I would like to add a button to return to the mainwindow, but I searched and I didn`t found anything about it. Thanks guys!