private void buttonOK_Click(object sender, EventArgs e)
        {
            IDGGraphExporter exporter = null;

            foreach (IDGGraphExporter ex in exporters)
            {
                if (ex.GetName() == listBoxExporters.SelectedItem.ToString())
                {
                    exporter = ex;
                    break;
                }
            }
            if (exporter == null)
            {
                MessageBox.Show("Error getting exporter", "Error");
                return;
            }

            SaveFileDialog sfd = new SaveFileDialog();

            sfd.DefaultExt = exporter.GetExtension();
            DialogResult result = sfd.ShowDialog();

            if (result == DialogResult.OK)
            {
                if (exporter.ExportGraph(fileInfos, sfd.FileName) != 0)
                {
                    MessageBox.Show("Could not export the file", "Error");
                }
                else
                {
                    MessageBox.Show("File successfully exported");
                }
            }
            this.Close();
        }