implement NavigateCommand

Apollon.WPF/Stores/ModalNavigationStore.cs

@@ -9,8 +9,7 @@ namespace Apollon.WPF.Stores
 {
     public class ModalNavigationStore
     {
-		private ViewModelBase _currentViewModel
-			;
+		private ViewModelBase _currentViewModel;
 		public ViewModelBase CurrentViewModel	
 		{
 			get

Apollon.WPF/Stores/NavigationStore.cs

@@ -0,0 +1,28 @@
+using Apollon.WPF.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Apollon.WPF.Stores
+{
+    public class NavigationStore
+    {
+        private ViewModelBase _currentViewModel;
+        public ViewModelBase CurrentViewModel
+        {
+            get
+            {
+                return _currentViewModel;
+            }
+            set
+            {
+                _currentViewModel = value;
+                CurrentViewModelChanged?.Invoke();
+            }
+        }        
+
+        public event Action CurrentViewModelChanged;
+    }
+}