setAlternatingRowColors() does not work in a subclassed QTableWidget

I've been developing an app in Qt 4.6.3, and have recently switched to 4.7.0-RC1. I have created two widgets by subclassing QTableWidget, in both the method setAlternatingRowColors() works when compiled with Qt4.6.3, but doesn't work under 4.7.0-RC1 (background is completely white).

Here's the code from one of the widgets:
const QColor tempCol1(25, 120, 10, 100);
const QColor tempCol2(80, 20, 10, 80);

QPalette tempPal;
tempPal.setColor(QPalette::Base, tempCol1);
tempPal.setColor(QPalette::AlternateBase, tempCol2);

setPalette(tempPal);

I've added a .zip with source code. When launched with "-style windows", alternating row colours are shown, so it might be more of QStyle Linux issue, than setAlternatingRowColors().