XAML-Map-Control/MapUiTools/WinUI/MapMenuItem.WinUI.cs

using System.Collections.Generic;
using System.Linq;
#if UWP
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Media;
#else
using Microsoft.UI.Xaml.Controls;
using Microsoft.UI.Xaml.Media;
#endif

namespace MapControl.UiTools;

public abstract partial class MapMenuItem : ToggleMenuFlyoutItem
{
    protected MapMenuItem()
    {
        Loaded += (_, _) =>
        {
            ParentMenuItems = ((Panel)VisualTreeHelper.GetParent(this)).Children.OfType<MapMenuItem>().ToList();
            Initialize();
        };

        Click += (_, _) => Execute();
    }

    protected IList<MapMenuItem> ParentMenuItems { get; private set; }
}