private function _getRootMenuSlug($sRootPageSlug)
{
if (isset(self::$_aRootMenuSlugCache[$sRootPageSlug])) {
return self::$_aRootMenuSlugCache[$sRootPageSlug];
}
self::$_aRootMenuSlugCache[$sRootPageSlug] = plugin_basename($sRootPageSlug);
return self::$_aRootMenuSlugCache[$sRootPageSlug];
}