C++ (Qt)
 QTreeWidget* tree = new QTreeWidget(this);
 QTreeWidgetItem* item1 = new QTreeWidgetItem(tree);
 item1->setText(0, "item1");
 QTreeWidgetItem* item2 = new QTreeWidgetItem(tree);
 item2->setText(0, "item2");
 QTreeWidgetItem* item3 = new QTreeWidgetItem(tree);
 item3->setText(0, "item3");
 
 tree->setStyleSheet("QTreeWidget::branch {image: url('img/1.jpg')}");
 tree->setFixedWidth(200);
 tree->setFixedHeight(100);