Finally I can goback!

source/iNKORE.UI.WPF.Modern.Gallery/Helpers/NavigationHelper.cs

@@ -99,68 +99,4 @@ private void UpdateBackButton()
             this.CurrentNavView.IsBackEnabled = this.Frame.CanGoBack ? true : false;
         }
     }
-
-    /// <summary>
-    /// Represents the method that will handle the <see cref="NavigationHelper.LoadState"/>event
-    /// </summary>
-    public delegate void LoadStateEventHandler(object sender, LoadStateEventArgs e);
-    /// <summary>
-    /// Represents the method that will handle the <see cref="NavigationHelper.SaveState"/>event
-    /// </summary>
-    public delegate void SaveStateEventHandler(object sender, SaveStateEventArgs e);
-
-    /// <summary>
-    /// Class used to hold the event data required when a page attempts to load state.
-    /// </summary>
-    public class LoadStateEventArgs : EventArgs
-    {
-        /// <summary>
-        /// The parameter value passed to <see cref="Frame.Navigate(Type, object)"/>
-        /// when this page was initially requested.
-        /// </summary>
-        public object NavigationParameter { get; private set; }
-        /// <summary>
-        /// A dictionary of state preserved by this page during an earlier
-        /// session.  This will be null the first time a page is visited.
-        /// </summary>
-        public Dictionary<string, object> PageState { get; private set; }
-
-        /// <summary>
-        /// Initializes a new instance of the <see cref="LoadStateEventArgs"/> class.
-        /// </summary>
-        /// <param name="navigationParameter">
-        /// The parameter value passed to <see cref="Frame.Navigate(Type, object)"/>
-        /// when this page was initially requested.
-        /// </param>
-        /// <param name="pageState">
-        /// A dictionary of state preserved by this page during an earlier
-        /// session.  This will be null the first time a page is visited.
-        /// </param>
-        public LoadStateEventArgs(object navigationParameter, Dictionary<string, object> pageState)
-            : base()
-        {
-            this.NavigationParameter = navigationParameter;
-            this.PageState = pageState;
-        }
-    }
-    /// <summary>
-    /// Class used to hold the event data required when a page attempts to save state.
-    /// </summary>
-    public class SaveStateEventArgs : EventArgs
-    {
-        /// <summary>
-        /// An empty dictionary to be populated with serializable state.
-        /// </summary>
-        public Dictionary<string, object> PageState { get; private set; }
-
-        /// <summary>
-        /// Initializes a new instance of the <see cref="SaveStateEventArgs"/> class.
-        /// </summary>
-        /// <param name="pageState">An empty dictionary to be populated with serializable state.</param>
-        public SaveStateEventArgs(Dictionary<string, object> pageState)
-            : base()
-        {
-            this.PageState = pageState;
-        }
-    }
 }

source/iNKORE.UI.WPF.Modern.Gallery/ItemPage.xaml.cs

@@ -41,14 +41,19 @@ public ControlInfoDataItem Item
             set { _item = value; }
         }
 
-        public ItemPage(ControlInfoDataItem item = null)
+        public ItemPage()
         {
             InitializeComponent();
-
+            if (System.Windows.MessageBox.Show("Instance of ItemPage created", "", MessageBoxButton.YesNo) == MessageBoxResult.No) throw new Exception("Instance of ItemPage created");
             Loaded += (s, e) => SetInitialVisuals();
             this.Unloaded += this.ItemPage_Unloaded;
+        }
 
-            if (item != null) LoadData(item);
+        public static ItemPage Create(ControlInfoDataItem item)
+        {
+            var page = new ItemPage();
+            if (item != null) page.LoadData(item);
+            return page;
         }
 
         private void ItemPage_Unloaded(object sender, RoutedEventArgs e)
@@ -120,7 +125,7 @@ private void OnRelatedControlClick(object sender, RoutedEventArgs e)
 
             var page = new ItemPage();
             page.LoadData(b.DataContext as ControlInfoDataItem);
-            this.Frame.Navigate(new ItemPage(b.DataContext as ControlInfoDataItem));
+            this.Frame.Navigate(ItemPage.Create(b.DataContext as ControlInfoDataItem));
         }
 
         public async void LoadData(ControlInfoDataItem item)

source/iNKORE.UI.WPF.Modern.Gallery/ItemsPageBase.cs

@@ -50,7 +50,7 @@ protected void OnItemGridViewItemClick(object sender, ItemClickEventArgs e)
             var gridView = (GridView)sender;
             var item = (ControlInfoDataItem)e.ClickedItem;
 
-            this.Frame.Navigate(new ItemPage(item), new DrillInNavigationTransitionInfo());
+            this.Frame.Navigate(ItemPage.Create(item), new DrillInNavigationTransitionInfo());
         }
 
         protected void OnItemGridViewKeyDown(object sender, KeyEventArgs e)

source/iNKORE.UI.WPF.Modern.Gallery/Navigation/NavigationRootPage.xaml.cs

@@ -304,12 +304,12 @@ private void OnNavigationViewSelectionChanged(NavigationView sender, NavigationV
                     if (selectedItem.DataContext is ControlInfoDataGroup)
                     {
                         var item = (ControlInfoDataGroup)selectedItem.DataContext;
-                        rootFrame.Navigate(new SectionPage(item));
+                        rootFrame.Navigate(SectionPage.Create(item));
                     }
                     else if (selectedItem.DataContext is ControlInfoDataItem)
                     {
                         var item = (ControlInfoDataItem)selectedItem.DataContext;
-                        rootFrame.Navigate(new ItemPage(item));
+                        rootFrame.Navigate(ItemPage.Create(item));
                     }
                 }
             }
@@ -381,11 +381,11 @@ private void OnControlsSearchBoxQuerySubmitted(AutoSuggestBox sender, AutoSugges
                 var infoDataItem = args.ChosenSuggestion as ControlInfoDataItem;
                 var itemId = infoDataItem.UniqueId;
                 EnsureItemIsVisibleInNavigation(infoDataItem.Title);
-                rootFrame.Navigate(new ItemPage(infoDataItem));
+                rootFrame.Navigate(ItemPage.Create(infoDataItem));
             }
             else if (!string.IsNullOrEmpty(args.QueryText))
             {
-                RootFrame.Navigate(new SearchResultsPage(args.QueryText));
+                RootFrame.Navigate(SearchResultsPage.Create(args.QueryText));
             }
         }
 

source/iNKORE.UI.WPF.Modern.Gallery/Pages/Controls/Windows/HyperlinkButtonPage.xaml.cs

@@ -17,7 +17,7 @@ public HyperlinkButtonPage()
 
         private async void GoToHyperlinkButton_Click(object sender, RoutedEventArgs e)
         {
-            NavigationRootPage.RootFrame.Navigate(new ItemPage(await ControlInfoDataSource.Instance.GetItemAsync(await ControlInfoDataSource.Instance.GetRealmAsync("Windows"), "ToggleButton")));
+            NavigationRootPage.RootFrame.Navigate(ItemPage.Create(await ControlInfoDataSource.Instance.GetItemAsync(await ControlInfoDataSource.Instance.GetRealmAsync("Windows"), "ToggleButton")));
         }
 
         private void Page_Loaded(object sender, RoutedEventArgs e)

source/iNKORE.UI.WPF.Modern.Gallery/SearchResultsPage.xaml.cs

@@ -36,10 +36,16 @@ public IEnumerable<Filter> Filters
             set { this.SetProperty(ref _filters, value); }
         }
 
-        public SearchResultsPage(string queryText = null)
+        public SearchResultsPage()
         {
             this.InitializeComponent();
-            if (queryText != null) LoadData(queryText);
+        }
+
+        public static SearchResultsPage Create(string queryText)
+        {
+            var page = new SearchResultsPage();
+            if (queryText != null) page.LoadData(queryText);
+            return page;
         }
 
         public void LoadData(string queryText)

source/iNKORE.UI.WPF.Modern.Gallery/SectionPage.xaml.cs

@@ -22,10 +22,16 @@ namespace iNKORE.UI.WPF.Modern.Gallery
     /// </summary>
     public partial class SectionPage : ItemsPageBase
     {
-        public SectionPage(ControlInfoDataGroup group = null)
+        public SectionPage()
         {
             InitializeComponent();
-            if (group != null) LoadData(group);
+        }
+
+        public static SectionPage Create(ControlInfoDataGroup group)
+        {
+            var page = new SectionPage();
+            if (group != null) page.LoadData(group);
+            return page;
         }
 
         public void LoadData(ControlInfoDataGroup group)

source/iNKORE.UI.WPF.Modern.Gallery/SettingsPage.xaml.cs

@@ -177,7 +177,7 @@ private void OnResetTeachingTipsButtonClick(object sender, RoutedEventArgs e)
 
         private async void soundPageHyperlink_Click(object sender, RoutedEventArgs args)
         {
-            this.Frame.Navigate(new ItemPage(await ControlInfoDataSource.Instance.GetItemAsync(await ControlInfoDataSource.Instance.GetRealmAsync("Windows"), "Sound")));
+            this.Frame.Navigate(ItemPage.Create(await ControlInfoDataSource.Instance.GetItemAsync(await ControlInfoDataSource.Instance.GetRealmAsync("Windows"), "Sound")));
         }
     }
 }

source/iNKORE.UI.WPF.Modern/Controls/Page.cs

@@ -5,10 +5,15 @@
 
 namespace iNKORE.UI.WPF.Modern.Controls
 {
+    // Something to say here:
+    // This page used to inherit from PageFunctionBase, but it caused a lot of weird issues.
+    // So I changed it to inherit from System.Windows.Controls.Page.
+    // I'm not sure if this is the right way to do it, but it works for now.
+
     /// <summary>
     /// Represents content that a Frame control can navigate to.
     /// </summary>
-    public class Page : PageFunctionBase
+    public class Page : System.Windows.Controls.Page
     {
         static Page()
         {
@@ -66,6 +71,7 @@ private void UpdateFrame(NavigationService navigationService)
 
         /// <summary>
         /// Invoked when the Page is loaded and becomes the current source of a parent Frame.
+        /// This will be fired only using ui:Frame instead of the original Frame.
         /// </summary>
         /// <param name="e">
         /// Event data that can be examined by overriding code. The event data is representative
@@ -79,6 +85,7 @@ protected virtual void OnNavigatedTo(NavigationEventArgs e)
         /// <summary>
         /// Invoked immediately before the Page is unloaded and is no longer the current
         /// source of a parent Frame.
+        /// This will be fired only using ui:Frame instead of the original Frame.
         /// </summary>
         /// <param name="e">
         /// Event data that can be examined by overriding code. The event data is representative
@@ -92,6 +99,7 @@ protected virtual void OnNavigatingFrom(NavigatingCancelEventArgs e)
         /// <summary>
         /// Invoked immediately after the Page is unloaded and is no longer the current source
         /// of a parent Frame.
+        /// This will be fired only using ui:Frame instead of the original Frame.
         /// </summary>
         /// <param name="e">
         /// Event data that can be examined by overriding code. The event data is representative