Why UltraComboEditor shows ValueMember instead of DisplayMember when DisplayMember is DBNull or even string.Empty ?

DataTable dt = new DataTable();
dt.Columns.Add("id", typeof(int));
dt.Columns.Add("name", typeof(string));
dt.Rows.Add(new object[] { 0, string.Empty });
ultraComboEditor1.DataSource = dt.DefaultView;
ultraComboEditor1.ValueMember = "id";
ultraComboEditor1.DisplayMember = "name";
ultraComboEditor1.Value = 0;

How to avoid this?