#include <QtGui>

class MyWidget: public QMainWindow
{
    Q_OBJECT
    
public:
    MyWidget(QWidget *parent = 0);
    
protected:
    void
            closeEvent(QCloseEvent* event) {

        qDebug() << "MainAppWindow::closeEvent";

     
        if (allowClose)
        {
            event->accept();
        }else{

// REMOVE COMMENT BELOW AND TRY AGAIN TO SEE ISSUE.
//            setVisible(false);
            event->ignore();

//            try to close again in 2 seconds.
            QTimer::singleShot(2000, this, SLOT(close()));
        }
    };

private slots: 
    void doSomething();
    
private:
    QHBoxLayout *layout;
    QPushButton *button;
    bool allowClose;
};        

MyWidget::MyWidget(QWidget *parent) : QMainWindow(parent)
{
    allowClose = false;

    setWindowTitle("Support Tester");
    layout = new QHBoxLayout;
    button = new QPushButton ("Do Something");
    button->setText(QString("The value of allow close is %1").arg(allowClose));
    layout->addWidget(button);
    
    QWidget *w = new QWidget;
    w->setLayout(layout);

    setCentralWidget(w);

    QObject::connect(button, SIGNAL(clicked()),
                     this, SLOT(doSomething()));
}

void MyWidget::doSomething()
{
    qDebug("something clicked");
    allowClose = !allowClose;
    button->setText(QString("The value of allow close is %1").arg(allowClose));
}

//This moc include is to get everything in a single file - for quick testing only
#include "main.moc"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MyWidget *myWin = new MyWidget();
    myWin->show();
    return app.exec();
}