[]API里 Tab控件的的内容为什么看不到的

API 里面查看Tab控件的内容，只显示如下：
Public Properties
Show Inherited Public Properties
Protected Properties
Show Inherited Protected Properties
Public Methods
Show Inherited Public Methods
Protected Methods
Show Inherited Protected Methods
Events
Show Inherited Events

都有什么属性、什么事件都不知道的...