RadzenGridColumn Filter

Hello Radzen Team,
When i wish to set a Filter at FirstRender like in your Demo Datagrid Filter API

protected override Task OnAfterRenderAsync(bool firstRender)
        var column = grid.ColumnsCollection.Where(c => c.Property == "FirstName").FirstOrDefault();

        if(column != null)
            column.FilterValue = "Nan";
            column.FilterOperator = FilterOperator.StartsWith;

    return base.OnAfterRenderAsync(firstRender);

i receive an compile error:

What am i doing wrong simple as it seems to be?

Version Radzen.Blazor 4.1.0

You seem to be using RadzenGrid instead of RadzenDataGrid. Is this the case? Our demo shows the latter.

Thats it!
Thanks @korchev