It seems that the week numbers could not be displayed in the horizontal and vertical line calendars. I added the following statements between the tags </today> and <weekdays> of horizontal line calendar.xml file in Shadow4, refresh rainlendar but still couldn't see the week numbers. I also tried to adjust the height and width of the calendar but it didn't help. Did I miss something or it was caused by a program bug?
<appearance element="bitmap.numbers.white.small" align="CENTER" />