The content area of CuteEditor is also based on an editable IFRAME as RadEditor and the same browser's behavior occurs in CuteEditor too. You can see my test in the following video: http://screencast.com/t/bg3g5IhMnm
Am I missing something? Can you please provide steps on how to remain the custom content in CuteEditor?
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!