how to use Scripted Event API

```
hi,
I'm new in using Exhibit.
I would like to know how to use Scripted Event API. I want to catch 
"onBeforeLoadingItems.exhibit" event and go some work before Exhibit load the 
Items.


Thanks for helping !!!
```

Original issue reported on code.google.com by `isabane2...@gmail.com` on 24 Jul 2013 at 3:18
