RibbonGroup添加QRadioButton：

QRadioButton * pRadio = new QRadioButton(tr("Radio"));
            pRadio->setToolTip(tr("Radio"));
            groupClipboard->addWidget(pRadio);
            connect(pRadio, SIGNAL(clicked(bool)), this, SLOT(RadioClicked(bool)));

添加事件：

protected slots:
    void RadioClicked(bool checked = false);

void QRibbonDemo::RadioClicked(bool checked)
{
    QMessageBox messageBox(QMessageBox::Information, windowTitle(),
        QLatin1String(""), QMessageBox::Ok, this);
    messageBox.setInformativeText(QLatin1String("radio click."));
    messageBox.exec();
}

效果如下：