Thing is, why would Samsung spend time and money cloning XCode when they've got a ton of other IDEs that look about the same, perform about the same, and work just as well if not better?
Who cares which they ended up copying ? It's a IDE for christ sake. Pick one, copy it. No need to reinvent the UI wheel for such a basic tool seen by a small percentage of people who don't really give a damn about how it looks.
Anyway, looking through their developer site, it seems that the Samsung IDE in question here is being phased out with SDK 3.5.1 which is moving to Eclipse.