QScrollArea border rendering problem

[Annihilator]

I'm rendering a border for a qscrollarea using stylesheets

QScrollArea#previews { border: 4px solid red; }

QScrollArea#previews { border: 4px solid red; }

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and

previewScrollArea->setObjectName("previews");

previewScrollArea->setObjectName("previews");

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It works well until a scrollbar appears. When I click a scrollbar arrow to scroll content, the qscrollarea border does not render near scrollbar
2012-03-27_2131.png
If I maximize an application window and resize it back then QScrollArea (probably) updates and border renders properly, but if I click a scrollbar arrow then I have the same problem again.

Thanks