#region Template management:

        /// <summary>
        /// Akcja po wczytaniu DomainDataSource szablonów
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void ExcelTemplateDomainDataSource_LoadedData(object sender, LoadedDataEventArgs e)
        {
            if (e.HasError)
            {
                System.Windows.MessageBox.Show(e.Error.ToString(), "Load Error", System.Windows.MessageBoxButton.OK);
                e.MarkErrorAsHandled();
            }
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void CreateTemplateButton_Click(object sender, RoutedEventArgs e)
        {
            NewExcelTemplatePopUpWindow createTemplate = new NewExcelTemplatePopUpWindow(excelTemplateDomainDataSource);
            Deployment.Current.Dispatcher.BeginInvoke(() => createTemplate.Show());
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void DeleteTemplateButton_Click(object sender, RoutedEventArgs e)
        {
            RemoveExcelTemplate();
        }

        /// <summary>
        ///
        /// </summary>
        private void RemoveExcelTemplate()
        {

        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void ExcelTemplateDataGrid_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            // Wypełnij listę kolumn wybranego szablonu:
            this.columnNamesList.Items.Clear();

            if (this.excelTemplateDataGrid.SelectedItem != null)
            {
                ExcelTemplate currentTemplate = this.excelTemplateDataGrid.SelectedItem as ExcelTemplate;
                if (!string.IsNullOrEmpty(currentTemplate.XmlColumnNames))
                {
                    List<string> columnNames = this.DeserializeFromXLMString(typeof(List<string>), currentTemplate.XmlColumnNames) as List<string>;
                    foreach (string s in columnNames)
                        this.columnNamesList.Items.Add(s);
                }
            }
        }

        private void excelTemplateDomainDataSource_LoadedData(object sender, LoadedDataEventArgs e)
        {
            this.srfBusyIndicator.IsBusy = false;
        }

        private void ExcelTemplateDomainDataSource_LoadingData(object sender, LoadingDataEventArgs e)
        {
            this.srfBusyIndicator.IsBusy = true;
        }

        #endregion