protected void Application_Start(object sender, EventArgs e)
    {
    
      var bundles = BundleTable.Bundles;

      var currentPage = Context.Handler as System.Web.UI.Page;
      var basePage = currentPage as BasePage;
      bundles.Add(new StyleBundle(basePage.GetGuiElement("css")).Include(
                  basePage.GetPath("css/default.css"),
                  basePage.GetPath("css/common.css")));
    }