public void Remove(string modelFile)
        {
            string model = modelFile;

            if (!MemberModels.ContainsKey(model))
            {
                if (UseRelativePath)
                {
                    model = XBimFederation.relativePath(Path.GetDirectoryName(fedFilePath), model);
                    if (!MemberModels.ContainsKey(model))
                    {
                        return;
                    }
                }
            }
            MemberModels.Remove(model);
        }