SearchBox isn't displayed when using RenderFragment instead of ItemCollection

[MartinSoka]

Hi,
i wanted to disable certain items within MudSelectExtended, hence i switched from ItemCollection to RenderFragment display of elements. However it looks like the SearchBox is usable only with ItemCollection. Is this true? If yes what could i do to disable certain elemnts dynamically within the ItemCollection and add text to them (like in the examples using ItemDisabledTemplate)

    <MudItem xs="12" sm="8" Class="d-flex gap-4">
        <MudSelectExtended  T="string" SearchBox="true" SearchBoxAutoFocus=true SearchBoxClearable=true Label="Standard Search" AnchorOrigin="Origin.BottomCenter" Variant="Variant.Outlined" HelperText="Search with 'Contains' logic"> 
          <ChildContent>
             @foreach (var state in _states)
                {
                    <MudSelectItemExtended Value="state" Disabled=@(state.StartsWith('A') ? true : false)>@state</MudSelectItemExtended>
                }   
          </ChildContent>  
        </MudSelectExtended>
    </MudItem>
</MudGrid>


@code {
    private string[] _states =

    {
        "Alabama", "Alaska", "American Samoa", "Arizona",
        "Arkansas", "California", "Colorado", "Connecticut",
        "Delaware", "District of Columbia", "Federated States of Micronesia",
        "Florida", "Georgia", "Guam", "Hawaii", "Idaho",
        "Illinois", "Indiana", "Iowa", "Kansas", "Kentucky",
        "Louisiana", "Maine", "Marshall Islands", "Maryland",
        "Massachusetts", "Michigan", "Minnesota", "Mississippi",
    };

    private bool SearchItems(string value, string searchString)
    {
        if (searchString == "")
        {
            return true;
        }

        if (value.StartsWith(searchString, StringComparison.CurrentCultureIgnoreCase))
        {
            return true;
        }

        return false;
    }
}```

[MartinSoka]

thx for the quick reply @mckaragoz I've used ItemDisabledFunc