/// <summary>
        /// OpenMessageFileCommandCF
        /// </summary>
        private void OpenMessageFileCommandCF()
        {
            MdiChild tw = GetTopMDIWindow();

            if (tw == null)
            {
                return;
            }

            string messageFileName = LST.OpenFileDialog("Cmm Datein (*.cmm)|*.cmm;|Alle Dateien (*.*)|*.*\"");

            if (String.IsNullOrEmpty(messageFileName))
            {
                return;
            }

            ((UserControlTCPMDIChild)tw.Content).MessageList     = LST.LoadList <Message>(messageFileName);
            ((UserControlTCPMDIChild)tw.Content).MessageFileName = messageFileName;
            if (((UserControlTCPMDIChild)tw.Content).MessageList.Count > 0)
            {
                ((UserControlTCPMDIChild)tw.Content).FocusMessageIndex = 0;
                ((UserControlTCPMDIChild)tw.Content).FocusMessage      = ((UserControlTCPMDIChild)tw.Content).MessageList[0];
            }
            _logger.Info(String.Format("Lode MessageFile File {0}", messageFileName));
        }
        /// <summary>
        /// Button_Load_Click
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Button_Load_Click(object sender, RoutedEventArgs e)
        {
            Debug.WriteLine("Button_Load_Click");

            Courses  = LST.LToO <Course>(LST.LoadList <Course>(AppDomain.CurrentDomain.BaseDirectory + "Courses.xml"));
            Students = LST.LToO <Student>(LST.LoadList <Student>(AppDomain.CurrentDomain.BaseDirectory + "Students.xml"));
            Bindings = LST.LToO <Binding>(LST.LoadList <Binding>(AppDomain.CurrentDomain.BaseDirectory + "Bindings.xml"));
            _bindingsWindow.Bindings = Bindings;

            Message = "We load Courses.xml, Students.xml and Bindings.xml";
        }