function activateRequired(targetControlId) {
    if (targetControlId) {
        field = document.getElementById(targetControlId);
        if (field) {
            field.setAttribute("aria-required", "true");
        }
    }
}

<EditForm Model="model" OnValidSubmit="HandleValidSubmitAsync">
                <FluentValidator></FluentValidator>
                <p>Selected Value: @model.UserId</p>
                <p>

                    <label class="required" for="...">@FieldsLoc["..."]</label>
                    <TelerikComboBox TItem="Model"
                                        TValue="long"
                                        OnRead="@ReadItems"
                                        @bind-Value="model.UserId"
                                        ValueField="Id"
                                        TextField="DisplayName"
                                        Filterable="true"
                                        FilterOperator="StringFilterOperator.Contains"
                                        Width="100%">
                    </TelerikComboBox>
                    <ValidationMessage For="@(() => model.UserId)"></ValidationMessage>
                </p>

                <TelerikButton OnClick=@(args=> createDialogOpen=false)>@AppLoc["Cancel"]</TelerikButton>
                <TelerikButton ThemeColor="@ThemeConstants.Button.ThemeColor.Primary">@AppLoc["Save"]</TelerikButton>
            </EditForm>

                RenderFragment item = d =>
                {
                    d.OpenComponent<ComboBoxPopupSettings>(20);
                    if (RowCount == 0) { RowCount= 20; }
                        d.AddAttribute(300, "MaxHeight", $"{(RowCount * 22).ToString()}px");
                        d.AddAttribute(301, "Class", "telCombo");
                        d.AddAttribute(302, "Enabled", "false");
                        d.CloseComponent();
                };

<FormItems>
              <FormItem Field="@nameof(ViewModel.SomeField)" />
              <FormItem Field="@nameof(ViewModel.NumericField)" Enabled="@some_variable"/>
</FormItems>

<div><TelerikFloatingLabel Text="Level 1"><TelerikComboBox Class="justification" AllowCustom="true" Data="@L1" ClearButton="false" TextField="Name" ValueField="TaxonomyId" @bind-Value=@L1Value OnChange="@(GetNextLevelTest)"></TelerikComboBox></TelerikFloatingLabel></div>

@if (!String.IsNullOrEmpty(L1Value))
{
    <div><TelerikFloatingLabel Text="Level 2"><TelerikComboBox Class="justification" @ref="TestRef" id="L2" AllowCustom="true" Data="@L2" ClearButton="false" TextField="Name" ValueField="TaxonomyId" @bind-Value=@L2Value OnChange="@(() => GetNextLevel(L2Value, 2))"></TelerikComboBox></TelerikFloatingLabel></div>
}

@if (!String.IsNullOrEmpty(L2Value))
{
    <div><TelerikFloatingLabel Text="Level 3"><TelerikComboBox Class="justification" Data="@L3" AllowCustom="true" TextField="Name" ClearButton=false ValueField="TaxonomyId" @bind-Value="@L3Value" OnChange="@(() => GetNextLevel(L3Value, 3))"></TelerikComboBox></TelerikFloatingLabel></div>
}

@if (!String.IsNullOrEmpty(L3Value))
{
    <div><TelerikFloatingLabel Text="Level 4"><TelerikComboBox Class="justification" Data="@L4" AllowCustom="true" TextField="Name" ClearButton=false ValueField="TaxonomyId" @bind-Value="@L4Value" OnChange="@(() => GetNextLevel(L4Value, 4))"></TelerikComboBox></TelerikFloatingLabel></div>
}

@if (!String.IsNullOrEmpty(L4Value))
{
    <div><TelerikFloatingLabel Text="Level 5"><TelerikComboBox Class="justification" Data="@L5" AllowCustom="true" ClearButton="false" TextField="Name" ValueField="TaxonomyId" @bind-Value="@L5Value" OnChange="@(() => GetNextLevel(L5Value, 5))"></TelerikComboBox></TelerikFloatingLabel></div>
}

        /// <summary>
        /// Populates a change ddl based on the parent id of the previous ddl and adds the selection to a ChangeDetailDTO object.
        /// </summary>
        /// <param name="selectedValue">This has to be a string because of the ability to edit the selected value</param>
        /// <param name="level"></param>
        public async Task GetNextLevel(string selectedValue, int level)
        {
            //Get the appropriate Taxonomy List object
            var SelectedLevels = GetType().GetProperty(DDLGroup+"Levels"??"").GetValue(this,null) as List<TaxonomyDdlDTO>;

            //if this is replacing a level that is last in the index, remove the old value. 
            //further down I'm clearing a range if a new dd value is selected to remove all the child values

            if (string.IsNullOrEmpty(selectedValue))
                return;

            //if the selected value is not changed, do nothing.
            if (level <= SelectedLevels!.Count())
            {
                if (selectedValue == SelectedLevels[level-1].TaxonomyId)
                return;
            }

            int selectedId = 0;
            int.TryParse(selectedValue, out selectedId);

            //Parent int of 0 means its a top-level item
            if (selectedId != 0)
            {
                var currentLevel = TaxonomyList.Where(x => x.TaxonomyId == selectedValue).Single();
                if (!SelectedLevels.Contains(currentLevel))
                {
                    SelectedLevels.Add(currentLevel);
                };
            }
            else
            {
                if (SelectedLevels.Count <= level-1 && SelectedLevels[level - 2] != null)
                    SelectedLevels.RemoveAt(level - 2);

                    SelectedLevels.Add(new TaxonomyDdlDTO()
                {
                    TaxonomyId = selectedValue,
                    Name = selectedValue
                });
            }

            //Event passes the new selection object to the parent page
            if(DDLGroup == "Current")
                await CurrentLevelSelectedEvent.InvokeAsync(SelectedLevels);
            else
                await NewLevelSelectedEvent.InvokeAsync(SelectedLevels);

            //populates the next dropdown list based on the selection justmade
            var nextLevelTaxonomy = TaxonomyList.Where(x => x.ParentId == selectedId).ToList();

            //Level5 has no children.
            if (level <= 4)
                GetType().GetProperty(string.Concat("L", level + 1)).SetValue(this, nextLevelTaxonomy);

            if (SelectedLevels.Count > level)
                SelectedLevels.RemoveRange(level-1, SelectedLevels.Count-1);
        }