U4.3.4: Mecanim blend trees, no more old docs?

So it's been a while since I've done Blend Trees in Mecanim, but all of a sudden, I have no idea ho to get them to work. I'm using Unity 4.3.4, and thus can't find any documentation. The following are what I see on my screen when I add a new blend tree:

Now, isn't there supposed to be a dropdown in which you could select 1D or 2D blends, and then something else like a graph just above transitions? Am I missing something obvious, or is this wrong?