公开方法与属性，以支援UI自动化用户端存取做为子物件集合之可卷动容器的控制项。
Exposes methods and properties to support UI Automation client access to controls that act as containers for a collection of individual, selectable child items.
会自动显示资料行行首和资料列行首，当表格垂直卷动时仍然可见。
Automatically displays column headers and row headers that remain visible as the table scrolls vertically.
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