I do not seem to be able to supply a callback from the parent component to the child, when teh child is rnedered using ““““`@Body“`:

    <CascadingValue  Value="isGB">
        <CascadingValue Value="HandleChange">
            @Body
        </CascadingValue>
    </CascadingValue>
    </div>```
@code {
    private void HandleChange(bool isgb)
    {
        throw new Exception();

        isGB = isgb;
        StateHasChanged();
    }
}

What I ave in the child component:

    [CascadingParameter]
    public EventCallback<bool> HandleChange { get; set; }

    private async Task ChangeIsGB(bool isgb)
    {
        IsGB = isgb;
        await HandleChange.InvokeAsync(isgb);
    }

But the event does not fire, sadly enough. Why?