Richard,
Unfortunately, remote panels by nature cannot fully support all of the functionality of the ActiveX controls, and the behavior you are seeing is expected. Please examine KnowledgeBase 2T9BDF6I at the following web site for more information.
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/88af6442a43b76e386256caa0065592f?OpenDocument
I also checked the example code databases, and it seems that a LabVIEW calendar has not been built yet, though it would be possible with the use of the "Get Date/Time" VIs in the Time and Dialog palette.
Hope this helps!
Sincerely,
Liz Fausak