Revision #5 has been created by qiang on Apr 6, 2011, 12:17:25 AM with the memo:
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Extending common classes to allow better customization
Likewise with `$breadcrumbs` and `$menu`. The more code you can move out of individual controllers and into common base classes, the more robust the code becomes and the easier it will be for others to maintain.
You'll find many avenues of customization as you learn more about Yii, and this framework of customized key classes will make it much easier.