Nested Set exension in YiiExt

[size="2"]I am looking for explanation for the Nested Set exension in YiiExt, any body can help?[/size]

Have you checked its readme?

yes i did

I want to select the root form a list in drop down list but its does not work, any idea?

Take a look at Yii Core CMS. You can read the code in the category section. The Category is a nested set implement. I have wrote the create, update and delete into separate Action, so you can use them for your Controllers.

thank you i will check it