private static string GenerateBaseGroupName(ITileSetDefinition tsd)
        {
            int    counter = 0;
            string name    = Strings.BaseLayerGroup;

            if (tsd.GroupExists(name))
            {
                counter++;
                name = Strings.BaseLayerGroup + counter;
            }
            while (tsd.GroupExists(name))
            {
                counter++;
                name = Strings.BaseLayerGroup + counter;
            }
            return(name);
        }