IoC and NavigationService implementation

main/MyFriendsAround.WP7/ViewModel/ViewModelBase.cs

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+using System;
+using System.Net;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Documents;
+using System.Windows.Ink;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Animation;
+using System.Windows.Shapes;
+    using MyFriendsAround.WP7.Helpers.Navigation;
+
+namespace MyFriendsAround.WP7.ViewModel
+{
+    public class ViewModelBase : GalaSoft.MvvmLight.ViewModelBase
+    {
+        private object context;
+        public object Context
+        {
+            get { return context; }
+            set
+            {
+                if (context == value)
+                    return;
+                context = value;
+                RaisePropertyChanged("Context");
+            }
+        }
+
+        /// <summary>
+        /// Gets PageNavigation from Container
+        /// </summary>
+        public IPageNavigation PageNav
+        {
+            get
+            {
+                IPageNavigation pageNav =
+                    (IPageNavigation)Container.Instance.Resolve(typeof(PageNavigation), "PageNavigation");
+                return pageNav;
+            }
+        }
+    }
+}