<label><TelerikCheckBox @bind-Value="@ShowFirstNameTemplate" /> Show FormItem Template for FirstName</label>

<TelerikForm Model="@Employee"
             Width="600px">
    <FormValidation>
        <DataAnnotationsValidator></DataAnnotationsValidator>
        <TelerikValidationSummary />
    </FormValidation>
    <FormItems>
        <FormItem Field="@nameof(Person.FirstName)" LabelText="First Name" Id="FirstNameNormal"></FormItem>
        <FormItem Field="@nameof(Person.FirstName)" Id="FirstNameWithTemplate">
            <Template>
                First Name with Template
                <br />
                <div style="padding:.2em;background:yellow">
                    <TelerikTextBox @bind-Value="@Employee.FirstName" />
                </div>
            </Template>
        </FormItem>
    </FormItems>
    <FormItemsTemplate Context="formContext">
        @{
            var formItems = formContext.Items.Cast<IFormItem>().ToList();
        }

        @if (ShowFirstNameTemplate)
        {
            <TelerikFormItemRenderer Item="@( formItems.First(x => x.Id == "FirstNameWithTemplate") )" />
        }
        else
        {
            <TelerikFormItemRenderer Item="@( formItems.First(x => x.Id == "FirstNameNormal") )" />
        }
    </FormItemsTemplate>
</TelerikForm>

@code {
    private Person Employee = new Person();

    private bool ShowFirstNameTemplate { get; set; }

    protected override void OnInitialized()
    {
        Employee = new Person()
        {
            FirstName = "John",
            LastName = "Doe",
            BirthDate = DateTime.Today.AddYears(-30)
        };

        base.OnInitialized();
    }

    public class Person
    {
        public string FirstName { get; set; } = string.Empty;

        public string LastName { get; set; } = string.Empty;

        public DateTime BirthDate { get; set; } = DateTime.Today;
    }
}