Add Criteria To Crud Generated Page

Hello every body,

I'm new on Yii, and I didn't find any tutorial or trick for the following problem:

I would like my CRUD generated page to be dependent of my logged user.
More precisely, I would like to add a criteria (userid="") to the request getting the list of my data in the CRUD page.

It doesn't seem to be difficult, but I didn't find the good tutorial which explain how the CRUD page are generated.

So if someone can give me a trick or a link on the appropriate tutorial..

Thanks a lot