如何在modernUI WPF应用程序中嵌套ModernMenu？

<mui:ModernWindow x:Class="YourNamespace.MainWindow"
                  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                  xmlns:mui="http://firstfloorsoftware.com/ModernUI"
                  Title="Your Application" Height="600" Width="800">
    <Grid>
        <!-- 在这里添加你的内容 -->
    </Grid>
</mui:ModernWindow>

<mui:ModernWindow x:Class="YourNamespace.MainWindow"
                  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                  xmlns:mui="http://firstfloorsoftware.com/ModernUI"
                  Title="Your Application" Height="600" Width="800">
    <Grid>
        <mui:ModernMenu x:Name="menu" VerticalAlignment="Top" Command="{Binding NavigateCommand}">
            <mui:ModernMenu.Links>
                <mui:Link DisplayName="Home" Source="/Views/Home.xaml" />
                <mui:Link DisplayName="About" Source="/Views/About.xaml" />
                <!-- 添加更多的链接 -->
            </mui:ModernMenu.Links>
        </mui:ModernMenu>
    </Grid>
</mui:ModernWindow>

public class MainViewModel : INotifyPropertyChanged
{
    public ICommand NavigateCommand { get; private set; }

    public MainViewModel()
    {
        NavigateCommand = new RelayCommand<string>(Navigate);
    }

    private void Navigate(string uri)
    {
        // 导航到指定的页面
        // 例如：NavigationService.Navigate(new Uri(uri, UriKind.Relative));
    }

    // 实现INotifyPropertyChanged接口的代码
}