Assembly: PresentationCore (in presentationcore.dll)
XML Namespace: http://schemas.microsoft.com/winfx/2006/xaml/presentation
/** @event */ public final void add_PreviewLostKeyboardFocus (KeyboardFocusChangedEventHandler value) /** @event */ public final void remove_PreviewLostKeyboardFocus (KeyboardFocusChangedEventHandler value)
In JScript, you can handle the events defined by a class, but you cannot define your own.
Because this event uses tunneling routing, the element that lost focus might be a child element instead of the element where the event handler is actually attached. Check the Source in the event data to determine the actual element that lost focus.
This event creates an alias for the Keyboard.PreviewLostKeyboardFocus attached event for this class, so that PreviewLostKeyboardFocus is part of the class members list when ContentElement is inherited as a base element. Event handlers that are attached to the PreviewLostKeyboardFocus event are attached to the underlying Keyboard.PreviewLostKeyboardFocus attached event and receive the same event data instance.