private async void btnSync_OnClick(object sender, RoutedEventArgs e)
{
btnSync.IsEnabled = false;
CustomerDataGroup firstGroup = _customerDataGroups.FirstOrDefault();
if (firstGroup != null)
{
firstGroup.Items.Clear();
}
var arLiveApi = new HttpClientWebApi();
await arLiveApi.Refresh();
PostSales();
LoadCustomers();
btnSync.IsEnabled = true;
}
