QSplitter not being drawn properly in QGraphicsScene

#include <QApplication>
#include <QUiLoader>
#include <QFile>
#include <QWidget>
#include <QGraphicsView>
#include <QGraphicsScene>

int main(int argc, char ** argv)
{
    QApplication app(argc,argv);
	
    QUiLoader loader;
    QFile mainWindowFile("mainwindow.ui");
    mainWindowFile.open(QFile::ReadOnly);
    QWidget *mw = loader.load(&mainWindowFile,0);
    mainWindowFile.close();
	
    QFile frameFile("DigitsDisplay.ui");
    frameFile.open(QFile::ReadOnly);
    QWidget *f = loader.load(&frameFile,0);
    frameFile.close();

    if(mw && f)
    {
        QGraphicsScene * scene = new QGraphicsScene();
        QGraphicsView *view = mw->findChild<QGraphicsView *>("graphicsView");
        if(view)
        {
            view->setScene(scene);
            scene->addWidget(f);
        }
        mw->show();
    }
    return app.exec();
}