/// <summary>
        /// Add a new message to the subtopic box
        /// </summary>
        /// <param name="message"></param>
        public void Send(Message message)
        {
            Messages.Add(message);

            // Create the textblock control
            TextBlock visualMessage = new TextBlock();
            visualMessage.TextWrapping = TextWrapping.Wrap;
            visualMessage.Text = message.Text;
            visualMessage.DataContext = Contents;

            // Set width databinding for 
            var widthBinding = new Binding("ActualWidth");
            widthBinding.Source = Content;
            widthBinding.Mode = BindingMode.OneWay;
            visualMessage.SetBinding(TextBlock.MaxWidthProperty, widthBinding);

            if (message.Sender == MessageSender.Ai)
            {
                // AI messages are displayed in bold type
                visualMessage.FontWeight = FontWeights.Bold;
            }
            else
            {
                // User messages are displayed with a prompt character,
                // and in italic type
                visualMessage.Text = " > " + visualMessage.Text;
                visualMessage.FontStyle = FontStyles.Oblique;
            }

            Contents.Children.Add(visualMessage);
        }
        /// <summary>
        /// Add a user message to the current subtopic box
        /// </summary>
        /// <param name="message"></param>
        public void UserSay(string message)
        {
            var userMessage = new Message()
            {
                Text = message,
                Sender = MessageSender.User
            };

            currentSubtopic.Send(userMessage);
            Scroller.ScrollToBottom();
        }
        /// <summary>
        /// Add an AI message to the current subtopic box
        /// </summary>
        /// <param name="message"></param>
        public void AiSay(string message)
        {
            var aiMessage = new Message()
            {
                Text = message,
                Sender = MessageSender.Ai
            };

            currentSubtopic.Send(aiMessage);
            Scroller.ScrollToBottom();
        }