anchor.diff:  		null,  LanguageUtil.get(pageContext, "no-results"));
   
   List<User> users = UserLocalServiceUtil.search(themeDisplay.getCompanyId(), firstName,"", lastName,screenName, emailAddress, 
  -		-1, params, andOperator, userSearchContainer.getStart(),userSearchContainer.getEnd(), comparator);
  +		-1, params, andOperator, userSearchContainer.getStart(),userSearchContainer.getEnd(), obc);
   
   int totalUsers = UserLocalServiceUtil.searchCount(themeDisplay.getCompanyId(), firstName,"", lastName,screenName, emailAddress, 
   		-1, params, andOperator);
  
positive.code: <%@page import="com.liferay.portal.util.comparator.UserFirstNameComparator"%>
  <%@page import="com.liferay.lms.learningactivity.calificationtype.CalificationType"%>
  <%@page import="com.liferay.lms.learningactivity.calificationtype.CalificationTypeRegistry"%>
  
negative.code: //List<User> listaUsuarioTotal = UserLocalServiceUtil.getGroupUsers(course.getGroupCreatedId());
  LinkedHashMap<String, Object> params = new LinkedHashMap<String, Object>();
  params.put("usersGroups", new Long(course.getGroupCreatedId())); 
  OrderByComparator obc = null;
  PortletPreferences portalPreferences = PortalPreferencesLocalServiceUtil.getPreferences(themeDisplay.getCompanyId(), themeDisplay.getCompanyId(), 1);
  if(Boolean.parseBoolean(portalPreferences.getValue("users.first.last.name", "false"))){
  	obc = new UserLastNameComparator(true);
  