docs: protected void disableStop() {
      EventTarget targ = svgp.getDocument().getRootElement();
      targ.removeEventListener(SVGConstants.SVG_EVENT_MOUSEMOVE, this, false);
      targ.removeEventListener(SVGConstants.SVG_EVENT_MOUSEUP, this, false);
      // FIXME: listen on the background object!
      targ.removeEventListener(SVGConstants.SVG_EVENT_MOUSEOUT, this, false);
    }