tree to Navigate

Hello guys!

i have some problems with a tree. I want the tree to navigate  me trough my pages. 

I added on the left hand side a tree with the following Items

final Tree tree = new Tree();
            tree.setImmediate(true);
          
            
            
            tree.addItem("Menu");
            tree.setChildrenAllowed("Menu",false);
            
            tree.addItem("Shops");
            tree.addItem("Shop erstellen");
            tree.addItem("Shop löschen");
            tree.addItem("Shop übersicht");
            tree.setParent("Shop übersicht", "Shops");
            tree.setParent("Shop erstellen", "Shops");
            tree.setParent("Shop löschen","Shops"); 
            tree.setChildrenAllowed("Shop erstellen",false);
            tree.setChildrenAllowed("Shop löschen",false);
            tree.setChildrenAllowed("Shop übersicht",false);
           
            
            tree.addItem("Warenkorb");
            tree.setChildrenAllowed("Warenkorb",false);
            
            tree.addItem("Transaktionen");
            tree.setChildrenAllowed("Transaktionen",false);
            tree.addItem("Reports");
            tree.setChildrenAllowed("Reports",false);
            tree.addItem("Artikel");
            tree.addItem("Artikel einstellen");
            tree.addItem("Artikelliste");
            tree.addItem("Artikel löschen");
            tree.setParent("Artikel einstellen", "Artikel");
            tree.setParent("Artikelliste", "Artikel");
            tree.setParent("Artikel löschen", "Artikel");
            
            
            tree.setChildrenAllowed("Artikel löschen",false);
            tree.setChildrenAllowed("Artikelliste",false);
            tree.setChildrenAllowed("Artikel einstellen",false);
            
            
            
              tree.addValueChangeListener(new Tree.ValueChangeListener() {

                @Override
                public void valueChange(Property.ValueChangeEvent event) {
                   Object eventValue = event.getProperty().getValue();
                   if(eventValue==null){
                       
                       return;
                   }
                   switch (eventValue.toString()){
                       case "Menu":
                           UI.getCurrent().getNavigator().navigateTo(Views.MAIN);
                           break;
                       
                   }}
                
                
                   
                   
                
            });
            first.addComponent(tree);
            

as you can see, i want, for example, if i click on Menu that i can navigate to the Main page. 

But unfortunately nothing happend

maybe some hints ? 

Which version of Vaadin are you using? At least with 7.4.x the value change listener gets triggered correctly. Do you get an exception? Does navigation work, if you manually change the URL?