I am very new in YII framework and i found there is a latest template engine called Dwoo(http://dwoo.org/). How can i use this two and how can i start work with this two Yii and Dwoo ? plz give some tips that how can i write my first application with yii too using CSS based templates ? Thanks in advanced. 
There already are some extensions for different template engines. You could check them out to learn how to write your own view renderer class.