initial load

YouTubeViewers.WPF/Stores/ModalNavigationStore.cs

@@ -0,0 +1,28 @@
+using System;
+using YouTubeViewers.WPF.ViewModels;
+
+namespace YouTubeViewers.WPF.Stores
+{
+    public class ModalNavigationStore
+    {
+        private ViewModelBase  _currentViewModel;
+
+        public ViewModelBase   CurrentViewModel
+        {
+            get { return _currentViewModel; }
+            set { 
+                _currentViewModel = value;
+                CurrentViewModelChanged?.Invoke();
+            }
+        }
+
+        public bool IsOpen => CurrentViewModel != null;
+
+        public event Action CurrentViewModelChanged;
+
+        public void Close()
+        {
+            CurrentViewModel = null;
+        }
+    }
+}