@classmethod
def PeekNavi(cls, pre=False):
    """Peek into the navigation cache
        @param cls: Class
        @keyword pre: bool

        """
    if pre:
        if cls._poscache.HasPrevious():
            return cls._poscache.PeekPrevious()
    elif cls._poscache.HasNext():
        return cls._poscache.PeekNext()
    return None, None
