protected override void DrawText(int index, DrawingContext drawingContext, Brush brush)
        {
            if (ActualWidth - sStyle.ScrollbarWidth < 0)
            {
                return;
            }
            FormattedText formatText;

            if (playListController.IsPlaying(index))
            {
                formatText = FormatText("> " + (index + 1) + ". " + controller.GetText(index), ref brush);
                formatText.SetFontWeight(FontWeights.Bold);
            }
            else
            {
                formatText = FormatText((index + 1) + ". " + controller.GetText(index), ref brush);
            }

            drawingContext.DrawText(formatText, new Point(3, (index - LowIndex) * sStyle.RowHeight + 3));
        }