Duplicated: http://feedback.telerik.com/Project/154/Feedback/Details/138793-fix-raddataentry-incorrectly-mapped-value-for-the-first-item-when-using-raddro How to reproduce: public partial class Form1 : Form { List<Product> productList; List<Supplier> suplierList; BindingSource productsBinding; public Form1() { InitializeComponent(); radDataEntry1.EditorInitializing += radDataEntry1_EditorInitializing; radDataEntry1.BindingCreating += radDataEntry1_BindingCreating; radDataEntry1.BindingCreated += radDataEntry1_BindingCreated; productList = new List<Product>(); suplierList = new List<Supplier>(); //productList.Add(new Product(1, "Chai")); //productList.Add(new Product(2, "Chang")); //productList.Add(new Product(3, "Aniseed Syrup")); productList.Add(new Product(4, "Chef Anton's Gumbo Mix")); productList.Add(new Product(5, "Tofu")); productList.Add(new Product(null, "Sir Rodney's Marmalade")); productList.Add(new Product(6, "Boston Crab Meat")); productList.Add(new Product(5, "Chartreuse verte")); productList.Add(new Product(2, "Ravioli Angelo")); productList.Add(new Product(4, "Perth Pasties")); suplierList.Add(new Supplier(1, "Exotic Liquids")); suplierList.Add(new Supplier(2, "New Orleans Cajun Delights")); suplierList.Add(new Supplier(3, "Tokyo Traders")); suplierList.Add(new Supplier(4, "Norske Meierier")); suplierList.Add(new Supplier(5, "New England Seafood Cannery")); suplierList.Add(new Supplier(6, "Leka Trading")); productsBinding = new BindingSource(); productsBinding.DataSource = productList; radBindingNavigator1.BindingSource = productsBinding; radDataEntry1.DataSource = productsBinding; } RadDropDownList radDropDownList1; void radDataEntry1_EditorInitializing(object sender, Telerik.WinControls.UI.EditorInitializingEventArgs e) { if (e.Property.Name == "SupplierID") { radDropDownList1 = new RadDropDownList(); radDropDownList1.DataSource = suplierList; radDropDownList1.ValueMember = "SupplierID"; radDropDownList1.DisplayMember = "CompanyName"; e.Editor = radDropDownList1; } } void radDataEntry1_BindingCreating(object sender, Telerik.WinControls.UI.BindingCreatingEventArgs e) { if (e.DataMember == "SupplierID") { e.PropertyName = "SelectedValue"; } } void radDataEntry1_BindingCreated(object sender, BindingCreatedEventArgs e) { if (e.DataMember == "SupplierID") { e.Binding.FormattingEnabled = true; e.Binding.Parse += new ConvertEventHandler(Binding_Parse); } } private void Binding_Parse(object sender, ConvertEventArgs e) { int tmpvalue; int? result = int.TryParse(e.Value.ToString(), out tmpvalue) ? tmpvalue : (int?)null; e.Value = result; } public class Product { private int? _supplierID; private string _productName; public Product(int? supplierID, string productName) { this._supplierID = supplierID; this._productName = productName; } public int? SupplierID { get { return this._supplierID; } set { this._supplierID = value; } } public string ProductName { get { return this._productName; } set { this._productName = value; } } } public partial class Supplier { private int? _supplierID; private string _companyName; public Supplier(int? supplierID, string companyName) { this._supplierID = supplierID; this._companyName = companyName; } public int? SupplierID { get { return this._supplierID; } set { this._supplierID = value; } } public string CompanyName { get { return this._companyName; } set { this._companyName = value; } } } } Workaround: handle the Shown event of the form and manually sync the the selected item in the editor with a cached initial indexprotected override void OnShown(EventArgs e) { base.OnShown(e); this.radDropDownList1.SelectedIndex = initialIndex - 1; }