I bought an SD version of a movie in iTunes. I own a Blu-Ray of the same movie. I then ripped the Blu-Ray to a 720p version. I used Subler to mark it as HD, and I made all the tags the same as the SD version. But, when I add it to itunes, the two don't combine into one listing in the movies section. Is there something special I need to do to make this happen?