code: protected String startColSpanDiv(ResponseWriter rw, SelectOneMenu menu, String clientId) throws IOException {
  		String clazz = Responsive.getResponsiveStyleClass(menu, false);
  		if (clazz != null && clazz.trim().length() > 0) {
  			clazz = clazz.trim();
  			rw.startElement("div", menu);
  			rw.writeAttribute("class", clazz, "class");
  			rw.writeAttribute("id", clientId, "id");
  			return clazz;
  		}
  
  		return null;
  	}
docs: Start the column span div (if there's one). This method is protected in order
  to allow third-party frameworks to derive from it.
  
  @param rw
  the response writer
  @throws IOException
  may be thrown by the response writer