No spontaneous showEvent generated when window is opened ?!

[yesint]

Dear all,
I'm trying to scroll very large list to specific position when main window is opened. As far as I understand for this I need to add code to spontaneous showEvent because this is one executed just after window is opened.
Here is the code:

void MainWindow::showEvent(QShowEvent *event){
    if(event->spontaneous()){
        qDebug()<<"after";
    } else qDebug()<<"before";
}

void MainWindow::showEvent(QShowEvent *event){
    if(event->spontaneous()){
        qDebug()<<"after";
    } else qDebug()<<"before";
}

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This always prints "before" - there is no spontaneous event at all! It seems that i missed something simple. Any help is deeply appreciated!