workaround for up folder

app/app.js

 app.config(['$stateProvider', '$urlRouterProvider',
     function($stateProvider, $urlRouterProvider) {
 
-        $stateProvider.state('home',{
-            url:'/?group',
+        $stateProvider.state('home', {
+            url:'/groups?group',
             reloadOnSearch: false,
             templateUrl:'views/home.html',
             controller:'HomeController'
         });
 
-        $stateProvider.state('rooms',{
+        $stateProvider.state('rooms', {
             url:'/rooms?group',
             reloadOnSearch: false,
             templateUrl:'views/home.html',
             controller:'HomeController'
         });
 
-        $stateProvider.state('freeroom',{
+        $stateProvider.state('freeroom', {
             url:'/freeroom',
             templateUrl:'views/freeroom.html',
             controller:'FreeRoomController'
         });
 
-        $urlRouterProvider.otherwise('/');
+        $urlRouterProvider.otherwise('/groups');
 
     }])
     .directive('dateNow', ['$filter', function($filter) {

app/controllers/home.controller.js

                 if (group != null && $scope.getSheetCount() < 5) {
                     var promiseLoadCourses = {
                         id: "promiseLoadCourses",
-                        groups: ["coursesView"]
+                        groups: ["coursesView"],
+                        loaderGroups: ["sidebar"]
                     };
                     if ($scope.weekId.id == null) {
                         WeeksBusiness.getCurrentWeek({group_id: group.Id, type_id: group.Type}, promiseLoadCourses)

app/views/sidebar.html

                 <ul class="col-sm-12 sidebar-group-list">
                     <li ng-show="DataShareBusiness.CurrentGroups.length != 0" class="col-xs-12">
                         <md-button class="md-primary md-hue-1 md-group-button col-xs-12"
-                                   ui-sref="{{getStateName()}}({group: DataShareBusiness.getSearchString(DataShareBusiness.getCurrentGroup().Parent)})">
+                                   ng-click="DataShareBusiness.upCurrentGroup()">
                             ..
                         </md-button>
                     </li>

app/views/toolbar.html

             <md-icon md-svg-icon="img/menu.svg"></md-icon>
         </md-button>
         <h2 ng-show="isInState('home') || isInState('rooms')">
-            <a ui-sref="{{getStateName()}}">{{ DataShareBusiness.SearchSeparator }} </a>
+            {{ DataShareBusiness.SearchSeparator }}
             <a ui-sref="{{getStateName()}}({group: DataShareBusiness.getSearchString(group)})" ng-repeat="group in DataShareBusiness.CurrentGroups">
                 {{ group.Name }}{{ $last ? "" : " " + DataShareBusiness.SearchSeparator + " " }}
             </a>

sdk/Business/DataShareBusiness.js

 
                 Rooms: null,
 
-                SearchSeparator: "|",
+                SearchSeparator: "~",
 
                 CurrentGroups: [],
 
                 upCurrentGroup: function()
                 {
                     if (data.CurrentGroups.length > 1) {
-                        data.setCurrentGroup(data.CurrentGroups[data.CurrentGroups.length - 2]);
+                        data.goToGroup(data.CurrentGroups[data.CurrentGroups.length - 2]);
                     }
                     else if (data.CurrentGroups.length == 1) {
-                        data.setCurrentGroup(null);
+                        data.goToGroup(null);
                     }
                 }
             };