code: function(rm, sId, iIdx){
  		rm.write("<div");
  		rm.writeAttribute("id", sId + "-add" + iIdx);
  		rm.addClass("sapUiRoadMapStepAdd" + iIdx);
  		rm.writeClasses();
  		rm.write("></div>");
  	}
docs: Writes the additonal style HTML into the rendermanger (see renderStep)