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.
As I'm new to the framework (2 weeks) - I tried to build a functionallity I already use a lot in my old framework (PRADO). This means combining a GridView with a form. And this in one page, what allows you to select a record from the grid and view the values in the same page without jumping to a new page.