QML Map Circle border-width isn't a read-only property

According to the link below, Map circles border-width is a read-only property.
The documentation says also that for no line, developers have to set its width to 0 to make it transparent.

http://doc.qt.nokia.com/qtmobility-1.2/qml-mapcircle.html#border.width-prop

So border-width IS NOT a read-only property.