How to use advance features in CI

[eluser]Unknown[/eluser]
I have just started to work learn CI but i have used Yii and i know some very good features like CRUD, AJAX, ORM support, Event Driven Programming are not there in CI.

So are there any alternates through which i can use these features in CI?

[eluser]Davide Bellini[/eluser]
Take a look here :
http://codeigniter.com/wiki/Contributions

There are a lot of libraries, helpers, ... that can help you.