I created the .qml file, added this code to it:
import QtQuick 1.0
So Creator shows the yellow lamp icon near "Rectangle", and when I press it, there is a crash with backtrace saying that QGraphicsDropShadowEffect::draw(QPainter*) cause a segfault. The full BT is in attach.
I think that's because of a bug 23205 ( https://bugreports.qt-project.org/browse/QTBUG-23205 ) in Qt 4.8+.