public static bool IsGestureEvent(this RoutedEventFlag flag) => (flag & _isGesture) != 0;
public static bool IsContextEvent(this RoutedEventFlag flag) => (flag & _isContextMenu) != 0;
public static bool IsManipulationEvent(this RoutedEventFlag flag) => (flag & _isManipulation) != 0;
public static bool IsDragAndDropEvent(this RoutedEventFlag flag) => (flag & _isDragAndDrop) != 0;
public static bool IsFocusEvent(this RoutedEventFlag flag) => (flag & _isFocus) != 0;
public static bool IsKeyEvent(this RoutedEventFlag flag) => (flag & _isKey) != 0;
public static bool IsPointerEvent(this RoutedEventFlag flag) => (flag & _isPointer) != 0;