def METHOD_NAME(self, callback_name, number):
    """
    Delete the specified callback bound to this object.
    Args:
        callback_name (str): the name of the callback to delete.
        number (int): the number of the callback to delete.
    Raises:
        RuntimeError if the callback is locked.
    """
    handler = type(self).script
    if handler:
        handler.del_callback(self.obj, callback_name, number)