private void AddToModelRbMessages(List <Rainbow.Model.Message> rbMessagesList)
        {
            List <InstantMessaging.Model.Message> messagesList = new List <InstantMessaging.Model.Message>();

            foreach (Rainbow.Model.Message rbMessage in rbMessagesList)
            {
                InstantMessaging.Model.Message msg = GetMessageFromRBMessage(rbMessage, rbConversation.Type);
                if (msg != null)
                {
                    messagesList.Insert(0, msg);
                    msg.AvatarSource = Helper.GetContactAvatarImageSource(msg.PeerId);
                }
            }

            lock (lockObservableMessagesList)
            {
                if (MessagesList.Count == 0)
                {
                    MessagesList.ReplaceRange(messagesList);
                }
                else
                {
                    MessagesList.AddRange(messagesList, System.Collections.Specialized.NotifyCollectionChangedAction.Reset, 0);
                }
            }
        }