Regarding The Analyze Motion Tool...

So I was following a video tutorial. And I got stuck I would say around the 1/3rdish area.

[homepage.mac.com]

And I was following it pretty well until I got to a part in which I can't seem to get by. I came to the part where I can zoom in on my motion tracker via "Track Size" under the Behaviors property. It's supposed to be right next to "Search Size" which I see, but it's not there. Anyone know how to access it? I'm trying to narrow down the basically the tracking size.