One of the most annoying CATIA features, especially when you work with large assemblies is reordering of specification tree in Products. Even as a programmer there is almost nothing you can do about it, because there is no direct way of reordering components in specification tree. Such a function has not been exposed to CATIA API yet. There are a few tools available on the internet and maybe you already use some of them. You may have even thought how the hell they work. So stop wondering, today I am going to show you how they (might) works :).