The video object inserted in Design mode still present after switching to HTML view. he issue is reproducible in IE11 and IE10.

Steps to reproduce:
1. Navigate to http://demos.telerik.com/aspnet-ajax/editor/examples/clientsideevents/defaultcs.aspx using Internet Explorer 11(11.0.9600.17105 - i assume that if one has ie11 it is this version)
2. Click the Media Manager in the toolbar.
3. Navigate to the folder "PublicRelations" and select the movie "RadNavigation.avi" or upload and select another file.
4. Click insert.
5. Switch to the HTML view in the bottom

Result: The movie is still present even though the view has been changed to HTML. I've noticed that this only occurs when the movie is set to autoplay and its play. If I wait till the movie has stopped and try and switch from Design to HTML it seems to work.