#include <QApplication>
#include <QMainWindow>
#include <QVBoxLayout>
#include <QSpinBox>
#include <QCheckBox>
int main( int argc, char* argv[] )
{
    // this makes spinbox buttons bigger, but it remains too small
    //QApplication::setAttribute(Qt::AA_Use96Dpi);
    QApplication app(argc, argv);
    QMainWindow dlg;
    QWidget centralWidget;
    centralWidget.setLayout( new QVBoxLayout() );
    QSpinBox* spinbox = new QSpinBox();
    spinbox->setMinimum( 0 );
    spinbox->setMaximum( 10 );
    centralWidget.layout()->addWidget( spinbox );
    centralWidget.layout()->addWidget( new QCheckBox() );
    dlg.resize( 200, 200 );
    dlg.setCentralWidget(&centralWidget);
    dlg.show();
    return app.exec();
}