//*************************************************************************
        //  Constructor: AddSelectedVerticesToGroupDialog()
        //
        /// <summary>
        /// Initializes a new instance of the <see
        /// cref="AddSelectedVerticesToGroupDialog" /> class.
        /// </summary>
        ///
        /// <param name="workbook">
        /// Workbook containing the graph data.
        /// </param>
        //*************************************************************************

        public AddSelectedVerticesToGroupDialog
        (
            Microsoft.Office.Interop.Excel.Workbook workbook
        )
        {
            Debug.Assert(workbook != null);

            m_oWorkbook   = workbook;
            m_sGroupName  = null;
            m_bIsNewGroup = false;

            InitializeComponent();

            // Instantiate an object that saves and retrieves the user settings for
            // this dialog.  Note that the object automatically saves the settings
            // when the form closes.

            m_oAddSelectedVerticesToGroupDialogUserSettings =
                new AddSelectedVerticesToGroupDialogUserSettings(this);

            ICollection <String> oUniqueGroupNames;

            if (ExcelTableUtil.TryGetUniqueTableColumnStringValues(m_oWorkbook,
                                                                   WorksheetNames.Groups, TableNames.Groups,
                                                                   GroupTableColumnNames.Name, out oUniqueGroupNames))
            {
                cbxGroupName.DataSource = oUniqueGroupNames.ToArray();
            }

            DoDataExchange(false);

            AssertValid();
        }