Assembly: System.Windows (in System.Windows.dll)
If the item is a UIElement with its own peer as reported by Owner, then information from that peer is forwarded. Next, the container peer (which could be ItemsControlAutomationPeer, ListBoxAutomationPeer, or another class) is used as a possible source. Finally, if there is no container peer, then this method returns true (the assumption here is that the item is a string that is intended to be presented to the user).
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.