private void img_Avatar_Loaded(object sender, RoutedEventArgs e)
        {
            int id = (int)(this.Tag);

            if (!wb_Dic.Keys.Contains(id))
            {
                dic_image.Add(id, (Image)sender);
                client.GetImageByAcquirerIdAsync(id);
            }
            else
            {
                dic_image[id].Source = wb_Dic[id];
            }
        }