Hi LaDonna ,
The RadMap supports using the HTTPS for map services which support HTTPS as well. I.e. Bing services supports HTTPS, so Bing map provider can be used over HTTPS. The OpenStreet services doesn't support HTTPS, so OpenStreet map provider will not work over HTTPS.
the Telerik team
Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat
for a walk through all the exciting stuff we ship with the new release!