Represents controls that visually expand to display content and collapse to hide content.
Assembly: UIAutomationClient (in UIAutomationClient.dll)
Aggregate controls—built with child objects that provide the UI for expand/collapse functionality—must support the control pattern while their child elements do not. For example, a combo box control is built with a combination of list box, button, and edit controls, but it is only the parent combo box that must support the .
A menu control, even though an aggregate of individual menu items, is an exception to this rule. The menu items support the control pattern, but the parent menu control does not. A similar exception applies to the tree and tree item controls.
Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.