公开方法与属性，以支援UI自动化用户端存取做为子项目集合之容器的控制项。
Exposes methods and properties to support UI Automation client access to controls that act as containers for a collection of child elements.
表示当做子项目集合之容器的控制项。
Represents controls that act as containers for a collection of child elements.
协力厂商控制项开发人员可以衍生自这个类别，将项目新增到新增项目下拉式方块，在集合编辑器或子属性编辑器。
Third-party control developers can derive from this class to add items to the "add item" drop-down box in the collection editor or sub-property editor.
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