July 28, 2014
Occurs when a screen tap occurs within the bounding area of a UIElement.
Assembly: System.Windows (in System.Windows.dll)
XMLNS for XAML: Not mapped to an xmlns.
The event is raised in response to a touch gesture occurring inside the object's bounding area. The event precedes the MouseMove event for the object.
You can define multiple events for objects in XAML content. However, if a child object and its parent object both define a event, the parent object's event occurs before the child object's event. This is not a case of a bubbling event; it indicates only that a touch event has occurred for both objects, potentially at different times depending on the layout and the composition of the visual tree.
The touch position that is reported in the event data may not be exactly on the boundary of the object because of the coalescing of touch movements.
events do not route, they can only be handled on the element that raises them.
MouseEnter and OnMouseEnter
Controls that inherit can provide handling for the event that acts as handler for all instances, by overriding the OnMouseEnter method. OnMouseEnter can be useful either for setting visual state, or for public or internal state properties. For instance, Slider implements OnMouseEnter in order to check the Thumb element's value for IsDragging (which invokes a particular behavior mode), and also to set visual state. For more information, see OnMouseEnter.