thinkphp如何继承自己的Action

thinkphp怎么继承自己的Action
GlobalAction.class.php

PHP code

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-->class GlobalAction extends Action
{
  public function _initialize()
  {

  }

}

IndexAction.class.php

PHP code

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-->class IndexAction extends GlobalAction
{

}

我这么写结果报错，说GlobalAction没有找到

------解决方案--------------------
class IndexAction extends GlobalAction之前，GlobalAction.class.php必须被加载进来，不然肯定会报错的。
------解决方案--------------------
include(__APP__/lib/GlobalAction.class.php)