ITEM SCRIPTING FOR RPGMVX

So for the past month I've been studying Ruby on and off, and I've finally finished going over the concepts I'll need to understand the scripts in VX. It's rather similar to java, really.

My question is this: Where are the items handled? I've looked through the script list twice, and right now it seems like I'll have to make new classes for what I want to do with the items and change the included scripts to work with that.