QTitanRibbon seems to break the windowModified property in QWidget

#include <QApplication>
#include <QGroupBox>
#include <QToolButton>
#include <QVBoxLayout>

#include <QtitanRibbon.h>
#include <QtnRibbonMainWindow.h>

class MainWindow : public RibbonMainWindow
{
  Q_OBJECT

 public:
  MainWindow()
      : RibbonMainWindow()
  {
    auto groupBox = new QGroupBox( "Buttons", this );

    auto button1 = new QToolButton( this );
    button1->setText( "Modify" );
    connect( button1, &QToolButton::clicked, this, [ this ]() { setWindowModified( true ); } );

    auto button2 = new QToolButton( this );
    button2->setText( "Save" );
    connect( button2, &QToolButton::clicked, this, [ this ]() { setWindowModified( false ); } );

    QVBoxLayout* vLayout = new QVBoxLayout;
    vLayout->addWidget( button1 );
    vLayout->addWidget( button2 );

    groupBox->setLayout( vLayout );

    setCentralWidget( groupBox );

    ribbonBar()->addPage( tr( "First Page" ) );
    ribbonBar()->setFrameThemeEnabled( true );

    setWindowTitle( tr( "TableView Test[*] - asd" ) );
    setWindowModified( false );
  }
};

int main( int argc, char* argv[] )
{
  QApplication app( argc, argv );
  MainWindow mw;
  mw.resize( 640, 480 );
  mw.show();
  return app.exec();
}

#include "main.moc"

    ribbonBar()->addPage( tr( "First Page" ) );
    ribbonBar()->setFrameThemeEnabled( true );