code: protected ChatGlyph createHistorySubtitle (int index, Graphics2D layoutGfx)
      {
          ChatMessage message = _history.get(index);
          int type = getType(message, true);
          return createSubtitle(message, type, layoutGfx, false);
      }
docs: Creates a subtitle for display in the history panel.
  
  @param index the index of the message in the history list