public static void AddContactPreviewDoubleClickHandler(DependencyObject element, ContactEventHandler handler)
 {
     EventUtility.AddEventHandler(element, PreviewContactDoubleClickEvent, handler);
 }
 public static void AddPreviewContactDownHandler(DependencyObject element, ContactEventHandler handler)
 {
     EventUtility.AddEventHandler(element, PreviewContactDownEvent, handler);
 }
 public static void AddContactEnterHandler(DependencyObject element, ContactEventHandler handler)
 {
     EventUtility.AddEventHandler(element, ContactEnterEvent, handler);
 }