Appends the GCONF_PREFIX to the key if needed

        @param key: The key to check
        @type key: C{string}
        @returns: The fixed key
        @rtype: C{string}

def _fix_key(self, key):
        """
        Appends the GCONF_PREFIX to the key if needed

        @param key: The key to check
        @type key: C{string}
        @returns: The fixed key
        @rtype: C{string}
        """
        if not key.startswith(self.GCONF_DIR):
            return self.GCONF_DIR + key
        else:
            return key