Can't change items aligment in QGraphicsLinearLayout

[T4ng10r]

I create one QGraphicsWidget inside which in two columns I want to place circles.
So inside this widget tree layout are created. One main to store two vertical Layouts.

m_hbMainLayout = new QGraphicsLinearLayout(Qt::Horizontal);
	vbLeftLayout = new QGraphicsLinearLayout(Qt::Vertical);
	vbRightLayout = new QGraphicsLinearLayout(Qt::Vertical);
 
	m_hbMainLayout->addItem(vbLeftLayout);
	m_hbMainLayout->addItem(vbRightLayout);
 
	if (layout())
		delete layout();
	setLayout(m_hbMainLayout);

m_hbMainLayout = new QGraphicsLinearLayout(Qt::Horizontal);
	vbLeftLayout = new QGraphicsLinearLayout(Qt::Vertical);
	vbRightLayout = new QGraphicsLinearLayout(Qt::Vertical);

	m_hbMainLayout->addItem(vbLeftLayout);
	m_hbMainLayout->addItem(vbRightLayout);

	if (layout())
		delete layout();
	setLayout(m_hbMainLayout);

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Then I add circles by

vbLeftLayout->addItem(devGUIChild);
        vbLeftLayout->setAlignment(devGUIChild,Qt::AlignVCenter);

vbLeftLayout->addItem(devGUIChild);
        vbLeftLayout->setAlignment(devGUIChild,Qt::AlignVCenter);

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But at the end circles aren't placed as I expect.


Those circles should be placed vertically evenly and in the middle. Right ones are placed evenly, but the left one isn't placed in the middle.
This approach works fine when I work with normal widgets and layout. Could some one tell me how to fix it?