need NavigationService

Apollon.WPF/ViewModels/NavBarPreparationViewModel.cs

@@ -10,10 +10,9 @@ namespace Apollon.WPF.ViewModels
 {
     public class NavBarPreparationViewModel : ViewModelBase
     {
-        public ICommand NavigateArchersCommand { get;}
+        public ICommand NavigateOverviewCommand { get;}
         public ICommand NavigateGroupsCommand { get;}
         public ICommand NavigateClassesCommand { get;}
-
-        
+        public ICommand NavigateArchersCommand { get;}       
     }
 }