code: function changeLayout(cls) {
          $('body').toggleClass(cls)
          $layout.fixSidebar()
          if ($('body').hasClass('fixed') && cls == 'fixed') {
              $pushMenu.expandOnHover()
              $layout.activate()
          }
          $controlSidebar.fix()
      }
docs: Toggles layout classes
  
  @param String cls the layout class to toggle
  @returns void