更新整理

WPFluent.Gallery/ViewModels/Pages/Navigation/MultilevelNavigationSample.cs

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+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file, You can obtain one at https://opensource.org/licenses/MIT.
+// Copyright (C) Leszek Pomianowski and WPF UI Contributors.
+// All Rights Reserved.
+
+namespace WPFluent.Gallery.ViewModels.Pages.Navigation;
+
+public partial class MultilevelNavigationSample(INavigationService navigationService)
+{
+    [RelayCommand]
+    private void NavigateForward(Type type)
+    {
+        _ = navigationService.NavigateWithHierarchy(type);
+    }
+
+    [RelayCommand]
+    private void NavigateBack()
+    {
+        _ = navigationService.GoBack();
+    }
+}