Setting the default value of a property to an enumeration value triggers on<Property>Changed signal.

import QtQuick 1.1

Rectangle {
    width: 200;
    height: 200;
    Item {
        property int status: 9
        onStatusChanged: console.log("Status in first item changed to:" + status)
    }

    Item {
        property int status: Qt.blue // Use any enumeration value, either from system or own.
        onStatusChanged: console.log("Status in second item changed to:" + status)
    }
}