TheItemContainerTheme inheritance Behavior

[workgroupengineering]

In discussion #10018 is answer the Equivalent of ItemsControl.ItemContainerStyle is Menu.ItemContainerTheme but the behavior isn't the same.

Considering this WPF example:

        <Menu ItemsSource="{Binding Columns}">
            <Menu.ItemContainerStyle>
                <Style TargetType="MenuItem">
                    <Setter Property="Header" Value="{Binding Description}"/>
                    <Setter Property="ItemsSource" Value="{Binding Columns}"/>
                </Style>
            </Menu.ItemContainerStyle>
        </Menu>

will produce a result like this:

The equivalent in Avalonia would be:

    <Menu Items="{Binding Columns}">
      <Menu.ItemContainerTheme>
        <ControlTheme TargetType="MenuItem" x:DataType="l:Column" BasedOn="{StaticResource {x:Type MenuItem}}">
          <Setter Property="Header" Value="{Binding Description}"/>
          <Setter Property="Items" Value="{Binding Columns}"/>
        </ControlTheme>
      </Menu.ItemContainerTheme>
    </Menu>

will produce a result like this:

As you can see, other than incorrect styling, submenus do not inherit the ItemContainerTheme.
is it a desired behavior? If so, how can I emulate WPF behavior?

[maxkatz6]

In general it can be done with styles, see https://github.com/AvaloniaUI/Documentation/issues/381#issue-1485800924 #3100 (comment)

But this difference with WPF indeed looks strange.

[workgroupengineering]

Thanks for the reply. For the moment I use this solution.
Can I do a PR that respects WPF behavior?

[maxkatz6]

Can you create an issue from this so it can be discussed there?
Also, we have now that in Avalonia Menu.ItemContainerTheme changes theme of top-level menu items. While in WPF it changes sub-menu items.
In WPF as well initial style of these menu items is different, how do developers change theme of the top-level items specifically?

[workgroupengineering]

Add PseudoClass :IsTop and using Selector inside ControlTheme

[maxkatz6]

No, my question was about wpf. I don't see how you can style them differently in wpf.

[workgroupengineering]

You must create ControlTemplate like this:

<ControlTemplate x:Key="{x:Static MenuItem.TopLevelHeaderTemplateKey}"
                 TargetType="{x:Type MenuItem}">
  ...
</ControlTemplate/>

You can find other info here.