private void AddButton_Click(object sender, RoutedEventArgs e)
        {
            var ves = new VariableExportSetting();

            ves.OutputFileName = "Hello.txt";
            variableExportContext.Add(ves);
        }
 internal void Delete(VariableExportSetting ves)
 {
     _variableExportSettings.Remove(ves);
     variableExportListBoxItems.Refresh();
 }
 internal void Add(VariableExportSetting ves)
 {
     _variableExportSettings.Add(ves);
     variableExportListBoxItems.Refresh();
 }