TreeWidget + Icon, does not scale

[giusepped]

I used:

InverterCheck::InverterCheck(QWidget* parent) : QWidget(parent)
{
	setupUi(this);
	treeWidget->setColumnCount(4);
	QList<QTreeWidgetItem *> items;
 
 
	 for (int i = 0; i < 10; ++i){
	QTreeWidgetItem *it = new QTreeWidgetItem(treeWidget);
  	it->setIcon(3,QIcon(":/images/ledspento.png"));
 
	it->setText(0,tr("Voc(Tmin)"));
	it->setFlags(Qt::ItemIsEnabled | Qt::ItemIsSelectable);
	items.append(it);
	}
	treeWidget->insertTopLevelItems(0, items);
}

InverterCheck::InverterCheck(QWidget* parent) : QWidget(parent)
{
	setupUi(this);
	treeWidget->setColumnCount(4);
	QList<QTreeWidgetItem *> items;
	 
 
	 for (int i = 0; i < 10; ++i){
	QTreeWidgetItem *it = new QTreeWidgetItem(treeWidget);
  	it->setIcon(3,QIcon(":/images/ledspento.png"));
	 
	it->setText(0,tr("Voc(Tmin)"));
	it->setFlags(Qt::ItemIsEnabled | Qt::ItemIsSelectable);
	items.append(it);
	}
	treeWidget->insertTopLevelItems(0, items);
}

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in order to have an Icon in the forth column.
But the Icon will not be resized to the correct size. Do I have to resize "by hand" the icon's size, or QIcon can do it for me?
G