public void AddHeader(PdfWriter writer, Document document)
{
if (PdfRptHeader == null) return;
if (!CacheHeader || _header == null)
_header = PdfRptHeader.RenderingReportHeader(document, writer, ColumnSummaryCellsData);
if (_header == null) return;
document.Add(_header);
CurrentRowInfoData.HeaderHeight = _header.TotalHeight;
}