Setting an itemview branch background using stylesheets

#include <QtGui>

class TreeWidget : public QTreeWidget
{
    Q_OBJECT
public:
    TreeWidget(QWidget *parent = 0) : QTreeWidget(parent)
    {
        QTreeWidgetItem *item = new QTreeWidgetItem(this, QStringList() << "Oak");
        new QTreeWidgetItem(item, QStringList() << "Birch");
        new QTreeWidgetItem(this, QStringList() << "Fir");
        new QTreeWidgetItem(this, QStringList() << "Pine");
    }
};

#include "main.moc"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QWidget widget;
    TreeWidget box;
    box.setStyleSheet("QTreeWidget::branch:selected {background: green;}");
    QVBoxLayout layout(&widget);
    layout.addWidget(&box);
    widget.show();
    return app.exec();
}