CButtonColumn in CGridView can be customised to include user built buttons. To learn a great deal about including custom buttons, read this excellent wiki.
This tutorial will show how to call an action from one custom button using AJAX instead of regular GET calls.
I installed phpseclib because I needed to do some AES encryption in my project. After all the hassle of installing php lib, I found out that Yii already has a security module (securityManager). I finally decided to keep using phpseclib because it has one big advantage over Yii securityManager module, it does not requite mcrypt to be installed in the phpserver!