Help me about QGridLayout and ScrollArea

[homerux]

Please help me this problem.
I using QGridLayout and array of QToolButton to display a array of images (Image is the icon of button). But the button (image) overlap...
I want to display the array button in 3 columns....
help me!
Thanks!
this is my code

QDir currentImageDir(LibPath+"/"+dir);
    currentImageDir.setFilter(QDir::Files | QDir::NoSymLinks | QDir::NoDotAndDotDot);
    QStringList ImageEntries = currentImageDir.entryList();
 
    singalImageMapper = new QSignalMapper(this);      
    QGridLayout* gridEPG;
    QScrollArea *scrollArea = new QScrollArea();
        QWidget *contentsWidget = new QWidget(scrollArea);
        gridEPG = new QGridLayout(contentsWidget);
 
        scrollArea->setWidgetResizable(true);
        scrollArea->setWidget(contentsWidget);
        contentsWidget->setLayout(gridEPG);
        contentsWidget->setMinimumSize(scrollArea->width(), scrollArea->height());       
 
        ui->imageLayout->addWidget(scrollArea, 1, 0, 2, 3);
         QString filename[ImageEntries.count()];
 
        for (int x = 0; x < ImageEntries.count(); x++)
        {
               // int row = x;
                //int col = i%3;
                filename[x]= ImageEntries.at(x);
                QToolButton* button = new QToolButton();
                button->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);
                button->setIcon(QIcon(LibPath + "/" + dir + "/" + filename[x]));
                button->setFixedSize(QSize(96,76));
                button->setIconSize(QSize(96,76));
                connect(button, SIGNAL(clicked()), singalImageMapper, SLOT(map()));
                singalImageMapper->setMapping(button, filename[x]);
                for(int i=0; i<3; i++)
                gridEPG->addWidget(button, x, i%3);
 
        }
        ui->fileImgUsing->setText(QString(imgPath + "/" + dir));
        connect(singalImageMapper, SIGNAL(mapped(QString)),this, SIGNAL(clicked(QString)));
        connect(this, SIGNAL(clicked(QString)),this, SLOT(onButtonClicked(QString)));

QDir currentImageDir(LibPath+"/"+dir);
    currentImageDir.setFilter(QDir::Files | QDir::NoSymLinks | QDir::NoDotAndDotDot);
    QStringList ImageEntries = currentImageDir.entryList();

    singalImageMapper = new QSignalMapper(this);      
    QGridLayout* gridEPG;
    QScrollArea *scrollArea = new QScrollArea();
        QWidget *contentsWidget = new QWidget(scrollArea);
        gridEPG = new QGridLayout(contentsWidget);

        scrollArea->setWidgetResizable(true);
        scrollArea->setWidget(contentsWidget);
        contentsWidget->setLayout(gridEPG);
        contentsWidget->setMinimumSize(scrollArea->width(), scrollArea->height());       
       
        ui->imageLayout->addWidget(scrollArea, 1, 0, 2, 3);
         QString filename[ImageEntries.count()];
     
        for (int x = 0; x < ImageEntries.count(); x++)
        {
               // int row = x;
                //int col = i%3;
                filename[x]= ImageEntries.at(x);
                QToolButton* button = new QToolButton();
                button->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);
                button->setIcon(QIcon(LibPath + "/" + dir + "/" + filename[x]));
                button->setFixedSize(QSize(96,76));
                button->setIconSize(QSize(96,76));
                connect(button, SIGNAL(clicked()), singalImageMapper, SLOT(map()));
                singalImageMapper->setMapping(button, filename[x]);
                for(int i=0; i<3; i++)
                gridEPG->addWidget(button, x, i%3);

        }
        ui->fileImgUsing->setText(QString(imgPath + "/" + dir));
        connect(singalImageMapper, SIGNAL(mapped(QString)),this, SIGNAL(clicked(QString)));
        connect(this, SIGNAL(clicked(QString)),this, SLOT(onButtonClicked(QString)));

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and my result

error.png