#include <QtGui>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QMainWindow w;
    w.setGeometry(300, 300, 400, 400);

    QWidget* mainWidget = new QWidget(&w);
    mainWidget->setGeometry(50, 50, 300, 300);

    QGridLayout* mainLay = new QGridLayout;
    mainLay->setSpacing(0);
    mainLay->setMargin(0);

    QPushButton* button01 = new QPushButton("Buton01");
    mainLay->addWidget(button01, 0, 0);

    QPushButton* button1 = new QPushButton("Buton1");
    button1->setFixedSize(250, 150);
    mainLay->addWidget(button1, 1, 0);

    QPushButton* button2 = new QPushButton("Button2");
    button2->setFixedSize(250, 150);
    mainLay->addWidget(button2, 1, 1);

    mainWidget->setLayout(mainLay);
    w.show();
    return a.exec();
}