code: protected void generateContainerStart(ResponseWriter writer, PanelGrid panelGrid, boolean idHasBeenRendered) throws IOException {
  		writer.startElement("div", panelGrid);
  		if (!idHasBeenRendered) {
  			String clientId = panelGrid.getClientId();
  			writer.writeAttribute("id", clientId, "id");
  		}
  		writeAttribute(writer, "dir", panelGrid.getDir(), "dir");
  
          Tooltip.generateTooltip(FacesContext.getCurrentInstance(), panelGrid, writer);
  
  
  		String styleclass = panelGrid.getStyleClass();
  		if (null != styleclass&& styleclass.trim().length()>0)
  			writer.writeAttribute("class", styleclass, "class");
  //		else
  //			writer.writeAttribute("class", "container", "class");
  
  		String style = panelGrid.getStyle();
  		if (null != style && style.trim().length()>0)
  			writer.writeAttribute("style", style, "style");
  	}
docs: Generates the start of the entire Bootstrap container.
  
  @param writer
  the current response writer.
  @throws IOException
  if something's wrong with the response writer.