private void saveGraph_Click(object sender, RoutedEventArgs e)
        {
            SaveFileDialog fileDialog = new SaveFileDialog();

            fileDialog.InitialDirectory = DefaultData.SavePath;
            fileDialog.OverwritePrompt  = true;
            fileDialog.ValidateNames    = true;

            if (fileDialog.ShowDialog() == true)
            {
                string file = fileDialog.FileName.Replace($@"{DefaultData.SavePath}\", "");

                if (file.Contains("\\"))
                {
                    return;
                }

                Graph.SaveGraph(file);
                DefaultData.DefaultGraph = file;
            }
        }