My Version of isCalendarWritable

cal.js

function isCalendarWritable(aCalendar) {
    //return true;
    /*return (!aCalendar.getProperty("disabled") &&
            !aCalendar.readOnly &&
            (!getIOService().offline ||
             aCalendar.getProperty("requiresNetwork") === false));*/
    //Begin -- redDragon's version --
    return (!aCalendar.getProperty("disabled") &&
            !aCalendar.readOnly &&
            (!getIOService().offline ||
             aCalendar.getProperty("cache.enabled") ||
             aCalendar.getProperty("requiresNetwork") === false));
    //end
}