Combining QWebView, QWebPage and createWindow (acceptNavigationRequest)

[smudo]

i have a simple app containing 3 classes:

1. MainWindow
2. Webpage
3. Webview

The Mainwindow is a simple QT-Form.
WebView is derived from QWebView because i want to create a new window if a user clicks on a button with javascript. The script looks like this:

onclick="window.open('somefile.htm','NewWindow','width=450,height=750')"

onclick="window.open('somefile.htm','NewWindow','width=450,height=750')"

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Without that, a click on that button does nothing...

The Webview-Class has the following createWindow-Function(opens an empty Webview):

QWebView* Webview::createWindow(QWebPage::WebWindowType type)
{
    switch(type)
    {
    case QWebPage::WebBrowserWindow: // The window is a regular web browser window
        QMessageBox::information(NULL, "Type", "WebBrowserWindow:");
        break;
    case QWebPage::WebModalDialog: // The window acts as modal dialog.
        QMessageBox::information(NULL, "Type", "WebModalDialog");
        break;
    default:
        break;
    }
 
    return new QWebView(NULL);
}

QWebView* Webview::createWindow(QWebPage::WebWindowType type)
{
    switch(type)
    {
    case QWebPage::WebBrowserWindow: // The window is a regular web browser window
        QMessageBox::information(NULL, "Type", "WebBrowserWindow:");
        break;
    case QWebPage::WebModalDialog: // The window acts as modal dialog.
        QMessageBox::information(NULL, "Type", "WebModalDialog");
        break;
    default:
        break;
    }

    return new QWebView(NULL);
}

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In my MainWindow i created my QWebView and QWebPage, placed it on the form and load the html content with the buttons via load(). Works so far.

webview = new Webview(ui->centralWidget);
webpage = new Webpage(this);
webview->setPage(webpage);
webview->load(QUrl("file:///c:/Users/flammig-to/Documents/QTWebview/login.html"));
webview->show();

webview = new Webview(ui->centralWidget);
webpage = new Webpage(this);
webview->setPage(webpage);
webview->load(QUrl("file:///c:/Users/flammig-to/Documents/QTWebview/login.html"));
webview->show();

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Finally my acceptNavigationRequest-Methos in my webpage-class (which is derived from QWebpage):

bool Webpage::acceptNavigationRequest(QWebFrame *frame, const QNetworkRequest &request, NavigationType type)
{
    return QWebPage::acceptNavigationRequest(frame,request,type);
}

bool Webpage::acceptNavigationRequest(QWebFrame *frame, const QNetworkRequest &request, NavigationType type)
{
    return QWebPage::acceptNavigationRequest(frame,request,type);
}

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My problem is:
acceptNavigationRequest is only called at load-Time - but not when i click on the button of my html-page. The NavigationType is QWebPage::NavigationTypeOther. If i click on the button with my onclick-handler a new (of course empty) windows opens.

Maybe someone can help me..
Smudo

oh... i forgot:
i use QT 4.6.1 on XP and Win7

[smudo]

ok, i found out: acceptNavigationRequest only gets fired when i hit - for example - the submit-button but not by simply hit a button.
So, a last question: how can i access the url (request) when QWebview calls createWindow?