Hi,
why when i press no button the program will close?

Qt Code: 
  1. void MainWindow::closeEvent(QCloseEvent *event){
  2.         QMessageBox msg(this);
  3.         msg.setText("Are you sure you want to Quit?");
  4.         QAbstractButton *no=msg.addButton(tr("No"),QMessageBox::ActionRole);
  5.         QAbstractButton *yes=msg.addButton(tr("Yes"),QMessageBox::ActionRole);
  6.         if(msg.clickedButton()==no){
  7.             event->ignore();
  8.         }
  9.         else{
  10.             event->accept();
  11.         }
  12.         msg.exec();
  13.     }
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thank u