private void AddItems(object[] items)
    {
        Contract.Requires(items != null);

        // added
        var command = AggregateAfterPrompt();
        ClearAfterPrompt();

        _paragraph.Inlines.Remove(_promptInline);

        var inlines = items.SelectMany(x =>
        {
            var value = ExtractValue(x);

            var newInlines = new List<Inline>();
            using (var reader = new StringReader(value))
            {
                var line = reader.ReadLine();

                newInlines.Add(new Run(line) { Foreground = GetForegroundColor(x) });
                newInlines.Add(new LineBreak());
            }

            return newInlines;

        }).ToArray();

        _paragraph.Inlines.AddRange(inlines);

        AddPrompt();

        // added
        _paragraph.Inlines.Add(new Run(command));

        CaretPosition = CaretPosition.DocumentEnd;
    }