#include <QApplication>
#include <QMainWindow>
#include <QTreeWidget>
#include <QTreeWidgetItem>
#include <QLayout>

class MainWindow : public QMainWindow
{
  Q_OBJECT

public:
  explicit MainWindow(QWidget *parent = 0)
    : QMainWindow(parent)
  {
    setCentralWidget(new QWidget(this));
    QVBoxLayout *layout = new QVBoxLayout(centralWidget());
    QTreeWidget *treeWidget = new QTreeWidget(this);
    layout->addWidget(treeWidget);
    for (const QString &name : { "one", "two", "three", "four" }) {
      treeWidget->addTopLevelItem(new QTreeWidgetItem(QStringList() << name));
    }
    QTreeWidgetItem *disabledItem = new QTreeWidgetItem(QStringList() << "last");
    disabledItem->setDisabled(true);
    treeWidget->addTopLevelItem(disabledItem);
  }

private:
  QTreeWidget *m_TreeWidget;
};


int main(int argc, char *argv[])
{
  QApplication a(argc, argv);
  MainWindow w;
  w.show();

  return a.exec();
}