如何在wpf c#中禁用devexpress主题窗口的上下文菜单

<Window x:Class="YourNamespace.YourWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:dxc="http://schemas.devexpress.com/winfx/2008/xaml/core"
        dxc:ThemeManager.ThemeName="None">
    <!-- 窗口内容 -->
</Window>

using DevExpress.Xpf.Core.Native;

public partial class YourWindow : Window
{
    public YourWindow()
    {
        InitializeComponent();
        DisableContextMenu();
    }

    private void DisableContextMenu()
    {
        DXWindow dxWindow = LayoutHelper.FindParentObject<DXWindow>(this);
        if (dxWindow != null)
        {
            dxWindow.Menu = null;
        }
    }
}