Binding a list of strings from a class object to a grid view combo box

    public class MyObject
    {
        public int Id { get; set; }

        public string Title { get; set; }

        public List<string> Items { get; set; }

        public MyObject(int id, string title, List<string> items)
        {
            this.Id = id;
            this.Title = title;
            this.Items = items;
        }
    }

        public RadForm1()
        {
            InitializeComponent();

            List<MyObject> sourceData = new List<MyObject>();
            for (int i = 0; i < 10; i++)
            {
                sourceData.Add(new MyObject(i,"Item" + i,new List<string>() { "SubItem" + i, "SubItem" + (i + 1), "SubItem" + (i + 2) }));
            }
            this.radGridView1.AutoGenerateColumns = false;
            GridViewDecimalColumn idColumn = new GridViewDecimalColumn("Id");
            idColumn.FieldName = "Id";
            this.radGridView1.Columns.Add(idColumn);
            GridViewTextBoxColumn titleColumn = new GridViewTextBoxColumn("Title");
            titleColumn.FieldName = "Title";
            this.radGridView1.Columns.Add(titleColumn);
            GridViewTextBoxColumn selectedItemColumn = new GridViewTextBoxColumn("SelectedItem");
            this.radGridView1.Columns.Add(selectedItemColumn);

            this.radGridView1.DataSource = sourceData;
            this.radGridView1.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;
            this.radGridView1.EditorRequired += radGridView1_EditorRequired; 
        }

        private void radGridView1_EditorRequired(object sender, EditorRequiredEventArgs e)
        {
            if (this.radGridView1.CurrentColumn.Name == "SelectedItem")
            {
                RadDropDownListEditor editor = new RadDropDownListEditor();
                e.Editor = editor;
             
                MyObject obj = this.radGridView1.CurrentRow.DataBoundItem as MyObject;
                if (obj != null)
                {
                    List<string> items = obj.Items;
                    RadDropDownListEditorElement el = editor.EditorElement as RadDropDownListEditorElement;
                    el.DataSource = items;
                }
            }
        }