default popup of menubar / mainwindow

[navid]

i found that problem is raised from

MainWindow::MainWindow(QWidget *parent)
                       : QMainWindow(parent), ui(new Ui::MainWindow)
{
ui->setupUi(this);
ui->menuView->installEventFilter(this);
//does not work: ui->menuView->installEventFilter(parent);
//does not work: ui->menuView->installEventFilter(ui->menuView);
}

MainWindow::MainWindow(QWidget *parent)
                       : QMainWindow(parent), ui(new Ui::MainWindow)
{
ui->setupUi(this);
ui->menuView->installEventFilter(this);
//does not work: ui->menuView->installEventFilter(parent);
//does not work: ui->menuView->installEventFilter(ui->menuView);
}

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