Menuitem greyed when command attribute is set

Using VS2022 on Windows 10 21H2 with Avalonia Toolkit and Avalonia for VS2022 installed.

A MenuItem with Command={Binding MainWindow.OnOpenCommand} is greyed out. MenuItem myMenu = this.FindControl<MenuItem>("FileOpen"); returns myMenu as expected but the Command property is null.

An oven ready VS2022 project demonstrating the issues/questions is here: https://github.com/g40/AvaloniaMenu

XAML:

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
        x:Class="AvaloniaApplication1.MainWindow"
        Title="AvaloniaApplication1">
        <DockPanel VerticalAlignment="Top">
          <Menu DockPanel.Dock="Top">
            <MenuItem Header="_File">
              <MenuItem Name="FileOpen" IsEnabled="True" Header="_Open..." Command="{Binding OpenCommand}" CommandParameter="{Binding ElementName=MainWindow}"/><Separator/>
              <MenuItem Header="_Exit"/>
            </MenuItem>
            <MenuItem Header="_Edit" >
              <MenuItem Header="Copy"/>
              <MenuItem Header="Paste"/>
            </MenuItem>
          </Menu>
        </DockPanel>
</Window

C# code

using Avalonia.Controls;
using System.Windows.Input;
using System.Reactive;
using System;

namespace AvaloniaApplication1
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            // yep, this works. we find the control
            MenuItem myMenu = this.FindControl<MenuItem>("FileOpen");
            // how to wire this up in code ????
            // myMenu.Command = openCommand;
        }
        //
        public bool CanExitCommand()
        {
            return true;
        }
        public void OnExitCommand() 
        {
            int i = 0;
        }
        //
        public bool CanOpenCommand()
        {
            return true;
        }
        public void OnOpenCommand()
        {
            int i = 0;
        }
    }
}

Many thanks for listening.

[rabbitism]

The binding is not correct. You should check the debug log, there should be a binding error. You can try to bind to {Binding $parent[Window].OnOpenCommand}

[timunie]

see #10787