Custom Lookup Field with labels

CustomLookup.cs

using System;
using System.Collections.Specialized;
using System.Web;
using System.Web.UI;

using Sitecore;
using Sitecore.Data.Items;
using Sitecore.Diagnostics;
using Sitecore.Shell.Applications.ContentEditor;
using Sitecore.StringExtensions;
using Sitecore.Text;

namespace LaunchSitecore.Shell
{
    public class NameLookupList : NameLookupValue
    {

        private UrlString urlString = null;

        protected override void OnLoad(EventArgs e)
        {
            Assert.ArgumentNotNull((object)e, "e");

            string origValue = this.Value;
            base.OnLoad(e); // this will modify this.Value using existing base logic and falsely throw a modified alert
            this.Value = origValue; // so reset the value back for comparison below
            Sitecore.Context.ClientPage.Modified = false; // if values have actually changed our code below will set this to true
            
            urlString = new UrlString(this.Value);
            if (Sitecore.Context.ClientPage.IsEvent)
                this.LoadValue();
            else
                this.BuildControl();
        }

        private void LoadValue()
        {
            if (this.ReadOnly || this.Disabled)
                return;
            System.Web.UI.Page page = HttpContext.Current.Handler as System.Web.UI.Page;
            NameValueCollection nameValueCollection = page == null ? new NameValueCollection() : page.Request.Form;
            UrlString urlString = new UrlString();
            foreach (string index1 in nameValueCollection.Keys)
            {
                if (!string.IsNullOrEmpty(index1) && index1.StartsWith(this.ID + "_Param", StringComparison.InvariantCulture) && !index1.EndsWith("_value", StringComparison.InvariantCulture))
                {
                    string input = nameValueCollection[index1];
                    string str = nameValueCollection[index1 + "_value"];
                    if (!string.IsNullOrEmpty(str))
                    {
                        urlString[input] = str;
                    }
                }
            }
            string str1 = urlString.ToString();
            if (this.Value == str1)
                return;
            this.Value = str1;
            this.SetModified();
        }

        private void BuildControl()
        {
            this.Controls.Clear();
            Item[] items = this.GetItems(Sitecore.Context.ContentDatabase.GetItem(this.ItemID));

            foreach (var item in items)
            {
                this.Controls.Add(new LiteralControl(this.BuildParameterKeyValue(item)));
            }
        }

        private string BuildParameterKeyValue(Item item)
        {
            Assert.ArgumentNotNull(item, "item");
            string uniqueId = GetUniqueID(this.ID + "_Param");
            string vertical = this.IsVertical ? "</tr><tr>" : string.Empty;
            string layout = "<table cellpadding=\"4\" cellspacing=\"0\" border=\"0\"><tr><td width=\"150px\">{0}{1}</td>{4}<td>{2} {3}</td></tr></table>";

            return layout.FormatWith(
                        item["Chemical Property"],
                        GetHtmlControl(uniqueId, null, "hidden", item.ID.ToString()),
                        GetHtmlControl(uniqueId, "_value", "text", urlString.Parameters[item.ID.ToString()]),
                        item["Chemical Unit"],
                        (object) vertical);
        }

        private string GetHtmlControl(string uniqueId, string suffix, string type, string value)
        {
            string readOnly = this.ReadOnly ? " readonly=\"readonly\"" : string.Empty;
            string disabled = this.Disabled ? " disabled=\"disabled\"" : string.Empty;
            value = !String.IsNullOrEmpty(value) ? StringUtil.EscapeQuote(HttpUtility.UrlDecode(value)) : null;

            string control = "<input id=\"{0}{1}\" name=\"{0}{1}\" type=\"{2}\" style=\"width:100px\" value=\"{3}\" {4} {5} />";
            return control.FormatWith(uniqueId, suffix, type, value, readOnly, disabled);
        }
    }
}

Images.txt

http://i.imgur.com/9Cal9j3.png