function disableParentScroll(disabled) {
      if (disabled && !lastParentOverFlow) {
        lastParentOverFlow = disableScrollTarget.css('overflow');
        disableScrollTarget.css('overflow', 'hidden');
      } else if (angular.isDefined(lastParentOverFlow)) {
        disableScrollTarget.css('overflow', lastParentOverFlow);
        lastParentOverFlow = undefined;
      }
    }
Prevent parent scrolling (when the SideNav is open)