public void channelsCallback(List <Message> messages, bool is_deleted = false)
 {
     if (messages != null)
     {
         foreach (Message message in messages)
         {
             if (message == null)
             {
                 continue;
             }
             if (message.machine_only || string.IsNullOrEmpty(message.text))
             {
                 continue;
             }
             if (message.channel_id != "net.app.core.pm")
             {
                 // PM for now
                 continue;
             }
             if (!message.is_deleted)
             {
                 ApnItem item = new ApnItem(message, this);
                 item.receivingAccount = this;
                 PrivateMessages.Add(item);
             }
             else
             {
                 IEnumerable <ApnItem> existing_items = PrivateMessages.Where(item => item.Id.ToString() == message.id);
                 if (existing_items != null)
                 {
                     if (existing_items.Count() > 0)
                     {
                         List <ApnItem> cache = new List <ApnItem>();
                         foreach (ApnItem item in existing_items)
                         {
                             cache.Add(item);
                         }
                         foreach (ApnItem item in cache)
                         {
                             PrivateMessages.Remove(item);
                         }
                         cache = null;
                     }
                 }
             }
         }
     }
 }