修复错误

Sample/MainWindow.xaml

@@ -9,6 +9,7 @@
     Width="800"
     Height="450"
     mc:Ignorable="d">
+    
     <Grid Background="{DynamicResource AppBackgroundBrush}">
         <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
             <TextBlock

Sample/MainWindow.xaml.cs

@@ -30,5 +30,19 @@ namespace Sample
             await HybridThemeManager.SwitchThemeAsync();
             SwitchThemeButton.IsEnabled = true;
         }
+        private void MinimizeButton_Click(object sender, RoutedEventArgs e)
+        {
+            this.WindowState = WindowState.Minimized;
+        }
+
+        private void MaximizeRestoreButton_Click(object sender, RoutedEventArgs e)
+        {
+            this.WindowState = (this.WindowState == WindowState.Maximized) ? WindowState.Normal : WindowState.Maximized;
+        }
+
+        private void CloseButton_Click(object sender, RoutedEventArgs e)
+        {
+            this.Close();
+        }
     }
 }