private async void AddService_Clicke(object sender, RoutedEventArgs e)
        {
            await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
            {
                AllServicesInput.Background = new SolidColorBrush(Colors.White);
            });

            if (AllServicesInput.SelectedIndex < 0 || !CurrentAgency.AddService(AllServicesInput.SelectedItem as Service))
            {
                await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
                {
                    AllServicesInput.Background = new SolidColorBrush(Colors.Red);
                });

                return;
            }

            ServiceInput.ItemsSource   = CurrentAgency.Services;
            AgencyServices.ItemsSource = CurrentAgency.Services;
        }