Assembly: UIAutomationClient (in uiautomationclient.dll)
This is a blocking method that returns after the AutomationElement has been expanded.
There are cases when a AutomationElementthat is marked as a leaf node might not know whether it has children until either the Collapse or the Expand method is called. This behavior is possible with a tree view control that does delayed loading of its child items. For example, Microsoft Windows Explorer might display the expand icon for a node even though there are currently no child items; when the icon is clicked, the control polls for child items, finds none, and removes the expand icon. In these cases clients should listen for a property-changed event on the ExpandCollapseState property by registering an event handler with the AddAutomationPropertyChangedEventHandler method.
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter EditionThe Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.