#include <QtGui>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QWidget myWidget;

    QVBoxLayout *layout = new QVBoxLayout;
    QPushButton *push1 = new QPushButton("checkable");
    QPushButton *push2 = new QPushButton("bold");
    push2->setObjectName("bold");
    myWidget.setStyleSheet("QPushButton { color: blue; } QPushButton:checked { color: red; font-weight: bold; } QPushButton#bold { font-weight: bold; }");
    push1->setCheckable(true);
    layout->addWidget(push1);
    layout->addWidget(push2);
    myWidget.setLayout(layout);

    myWidget.show();

    return app.exec();
}