可以去官方搜索Yii扩展：Extensions | Yii PHP Framework
http://www.yiiframework.com/extensions/?tag=tree
Yii checkbox in dropdown
http://*.com/questions/11608318/yii-checkbox-in-dropdown
yii_extension_CGridView相关第三方扩展汇总
http://blog.csdn.net/phpgcs/article/details/11928543
Extensions
http://www.yiiframework.com/extensions/?tag=input&sort=update.desc
jQuery File Upload Demo
xupload，带上传图片预览功能