CalendarControl using ImageManager for MarkUp

I am unable to get an image from an ImageManager control to show up in the Markup for a Calendar event.  I am able to add a CalendarEvent to the Calendar and have the markup displayed correctly with the exception of an icon. 

The help file references setting the source to the icon id of the ImageManager.  I have the ImageManager loaded with icons with id 1 through 16.  the markup source includes the following line:

<image source='1'/>

With other controls you need to load the icons like with the commandbar.  but with the calendar control there is no method to load icons...

Am I missing something???

Thank you in Advance,

Tim