In this wiki I will show how could use a Captcha in yii CForm. The easy way to show captcha image is create a form using CHtml method & CActiveForm, but CForm also should be able to show a captcha.

In this article you'll learn how to send additional form data when uploading files using XUpload widget

Sometimes you have CJuiDialog with different content but same buttons (or width, height). If you don't want to repeat yourself this is a great solution:

You have a multilingual application, and you want the URL of a page to be different for different languages, to account for SEO. The URL for the contact page for example should look like http://something.com/en/contact in english, and http://something.com/de/contact in german. This tutorial describes how to make it happen.
Note that currently selected language is always a part...

You have to extend the widget class and configure it for user login widget