Applying the "Saddle:1" NBT tag does not saddle a horse

What I expected to happen was...:
When I applied an NBT tag of "Saddle:1" to a horse, such as with the summon or entitydata commands, the horse should have been saddled.

What actually happened was...:
The horse was not saddled.

Steps to Reproduce:
1. Type the command "/summon EntityHorse ~ ~ ~

{Saddle:1}

"
2. Look at the horse, and it won't be saddled.