Indicates whether the event has been handled by the app. If the app has moved the focus to another desired location, it should set the Handled property to TRUE. When the Handled property is FALSE after the event handler returns, default action is taken. The default action is to try to find the next tab stop child window in the app and try to move focus to that window. If no other window exists to move focus, focus is cycled within the web content of the WebView.