Displays all child nodes, controls, or content of the AutomationElement.
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 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.