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tw = new QTreeWidget;

QTreeWidgetItem* pRootItem;
pRootItem = new QTreeWidgetItem(tw);
pRootItem->setText(0, tr("Список1"));

QTreeWidgetItem* pItem;
pItem = new QTreeWidgetItem(pRootItem);
pItem->setText(0, tr("a1"));

pItem = new QTreeWidgetItem(pRootItem);
pItem->setText(0, tr("a2"));


pRootItem = new QTreeWidgetItem(tw);
pRootItem->setText(0, tr("Список2"));

QTreeWidgetItem* pItem;
pItem = new QTreeWidgetItem(pRootItem);
pItem->setText(0, tr("b1"));

pItem = new QTreeWidgetItem(pRootItem);
pItem->setText(0, tr("b2"));

CSpinBoxDelegate * sb = new CSpinBoxDelegate(); // вставляем делегат в сторку "a1"
tw->setItemDelegateForRow(1, sb);