private bool SpecialColumnSortAtIndex(int index)
        {
            if (this.columnInfos == null)
            {
                return(false);
            }

            UPMGridColumnInfo columnInfo = this.columnInfos[index];

            return(columnInfo != null ? columnInfo.SpecialSort : false);
        }
        private bool NumericColumnAtIndex(int index)
        {
            if (this.columnInfos == null)
            {
                return(false);
            }

            UPMGridColumnInfo columnInfo = this.columnInfos[index];

            return(columnInfo != null ? columnInfo.IsNumeric : false);
        }