QCursor object is not updated in some cases

[Arus1]

In desktop application (ported with QT 5.2) cursor type is not updated after calling QApplication::setOverrideCursor(QCursor(Qt::BlankCursor));
when entering QGraphicsView widget. Instead of hiding cursor, the cursor type is shown
like in last opened foreground window and is updated only after clicking on the view.
How to fix the issue or is there a known issue in QT 5.2?
Thanks in advance.