/// <summary>
        /// Handles the Loaded event of the Window control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="RoutedEventArgs"/> instance containing the event data.</param>
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            lblApiUsage.Text = $"API Usage: {F1Api.ApiCounter}";
            // add group types
            ExportGroupTypes = exporter.GetGroupTypes();

            foreach (var groupType in ExportGroupTypes)
            {
                GroupTypesCheckboxItems.Add(new CheckListItem {
                    Id = groupType.Id, Text = groupType.Name, Checked = true
                });
            }

            cblGroupTypes.ItemsSource = GroupTypesCheckboxItems;

            txtImportCutOff.Text = DateTime.Now.ToShortDateString();
        }