TermsAgreementField.cs

using Sitecore.Data.Items;
using Sitecore.Forms.Mvc.Attributes;
using Sitecore.Forms.Mvc.Controllers.ModelBinders.FieldBinders;
using Sitecore.Forms.Mvc.Models.Fields;
using Sitecore.Forms.Mvc.Validators;

namespace MyProject.Integration.Wfm
{
	public class TermsAgreementField : CheckBoxField
	{
		public string TermsLabel { get; set; }

        	[DynamicRequired("IsRequired", ErrorMessage = "The {0} field is required.")]
		[PropertyBinder(typeof(CheckboxFieldValueBinder))]
		public override object Value { get; set; }

		public override bool IsRequired
		{
			get { return true; }
		}

	    	public TermsAgreementField(Item item) : base(item) {}     
	}
}