code: protected void scrollUpSubtitles (int dy)
      {
          // dirty and move all the old glyphs
          Rectangle vbounds = _target.getViewBounds();
          int miny = vbounds.y + vbounds.height - _subtitleHeight;
          for (Iterator<ChatGlyph> iter = _subtitles.iterator(); iter.hasNext();) {
              ChatGlyph sub = iter.next();
              sub.translate(0, dy);
              if (sub.getBounds().y <= miny) {
                  iter.remove();
                  _target.abortAnimation(sub);
              }
          }
      }
docs: Scroll all the subtitles up by the specified amount.