public class ExpansionVisibilityConverter : IValueConverter
    {
        #region IValueConverter Members

        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if ((value as DataRecordPresenter).IsHeaderRecord
                ||
                !isContainChildRecordCountCell(((value as DataRecordPresenter).Record as DataRecord))
                ||
                ((value as DataRecordPresenter).Record as DataRecord).Cells["ChildRecordCount"].Value == null
                ||
                ((value as DataRecordPresenter).Record as DataRecord).Cells["ChildRecordCount"].Value.ToString() == "0")
            {
                return Visibility.Hidden;
            }
            return Visibility.Visible;
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            return Binding.DoNothing;
        }

        private bool isContainChildRecordCountCell(DataRecord dr)
        {
            foreach (Field field in dr.FieldLayout.Fields)
            {
                if (field.Label.ToString().Equals("ChildRecordCount", StringComparison.InvariantCultureIgnoreCase))
                    return true;
            }

            return false;
        }

        #endregion
    }