There seems to be another bug in the actually version of your control. With following code, taken out of your examples, the vertical eventbar do not appear correctly.
<mc:calendar id="CalendarCtrl" runat="server" SelectedDate="2007-03-09">
<mc:CalendarItem StartDate="2007-03-09 10:15" LabelColor="White"
Label="new label" EndDate="2007-03-09 12:15"></mc:CalendarItem>
In the attachment you'll find a example. On the left side there is a correct output of the blue example from above (created with version 1.8), on the right side is a incorrect output of the blue example from above (created with version 2.3).
With this simple code-situation the older version of the control renders the eventbar with two table-rows (<tr>). The newer version only renders the eventbar only with one table-row, why?
I cannot find any work-around to this behavior, so I hope you can tell me a way.