U.S. States DropDownList DataType for Umbraco

USStatesDataType.cs

using System;
using System.Collections.Generic;
using System.Web.UI.WebControls;
using umbraco.cms.businesslogic.datatype;

namespace Our.Umbraco.DataTypes
{
	public class USStates : AbstractDataEditor
	{
		private DropDownList m_Control = new DropDownList();

		public IDictionary<string, string> StateDictionary = new Dictionary<string, string>
		{
			{"Alabama", "AL"},
			{"Alaska", "AK"},
			{"American Samoa", "AS"},
			{"Arizona", "AZ"},
			{"Arkansas", "AR"},
			{"California", "CA"},
			{"Colorado", "CO"},
			{"Connecticut", "CT"},
			{"Delaware", "DE"},
			{"District of Columbia", "DC"},
			{"Federated States of Micronesia", "FM"},
			{"Florida", "FL"},
			{"Georgia", "GA"},
			{"Guam", "GU"},
			{"Hawaii", "HI"},
			{"Idaho", "ID"},
			{"Illinois", "IL"},
			{"Indiana", "IN"},
			{"Iowa", "IA"},
			{"Kansas", "KS"},
			{"Kentucky", "KY"},
			{"Louisiana", "LA"},
			{"Maine", "ME"},
			{"Marshall Islands", "MH"},
			{"Maryland", "MD"},
			{"Massachusetts", "MA"},
			{"Michigan", "MI"},
			{"Minnesota", "MN"},
			{"Mississippi", "MS"},
			{"Missouri", "MO"},
			{"Montana", "MT"},
			{"Nebraska", "NE"},
			{"Nevada", "NV"},
			{"New Hampshire", "NH"},
			{"New Jersey", "NJ"},
			{"New Mexico", "NM"},
			{"New York", "NY"},
			{"North Carolina", "NC"},
			{"North Dakota", "ND"},
			{"Northern Mariana Islands", "MP"},
			{"Ohio", "OH"},
			{"Oklahoma", "OK"},
			{"Oregon", "OR"},
			{"Palau", "PW"},
			{"Pennsylvania", "PA"},
			{"Puerto Rico", "PR"},
			{"Rhode Island", "RI"},
			{"South Carolina", "SC"},
			{"South Dakota", "SD"},
			{"Tennessee", "TN"},
			{"Texas", "TX"},
			{"Utah", "UT"},
			{"Vermont", "VT"},
			{"Virgin Islands", "VI"},
			{"Virginia", "VA"},
			{"Washington", "WA"},
			{"West Virginia", "WV"},
			{"Wisconsin", "WI"},
			{"Wyoming", "WY"}
		};

		public override string DataTypeName
		{
			get
			{
				return "U.S. States";
			}
		}

		public override Guid Id
		{
			get
			{
				return new Guid("7B38C968-286E-4D3C-8C95-608CE3EA666C");
			}
		}

		public USStates()
		{
			base.RenderControl = this.m_Control;

			this.m_Control.Init += new EventHandler(this.m_Control_Init);

			base.DataEditorControl.OnSave += new AbstractDataEditorControl.SaveEventHandler(this.DataEditorControl_OnSave);
		}

		private void m_Control_Init(object sender, EventArgs e)
		{
			this.m_Control.DataSource = this.StateDictionary;
			this.m_Control.DataTextField = "Key";
			this.m_Control.DataValueField = "Value";
			this.m_Control.DataBind();

			if (base.Data.Value != null)
			{
				this.m_Control.SelectedValue = base.Data.Value.ToString();
			}
		}

		private void DataEditorControl_OnSave(EventArgs e)
		{
			base.Data.Value = this.m_Control.SelectedValue;
		}
	}
}

The list of states was copied from an answer on the StackOverflow question: ASP.NET MVC US State Drop Down List

Am I missing something? This is not working for me. I'm using Umbraco 7.2.8.