QDialog* dlg = new QDialog(parent, Qt::WA_DeleteOnClose);dlg->show();
QDialog* dlg = new QDialog(parent, 0, false, Qt::WDestructiveClose); dlg->show();
QDialog* dlg = new QDialog(parent, 0, Qt::WDestructiveClose);
QDialog* dlg = new QDialog(parent, 0, true);