text: public void SetBackgroundImage(int pictureIndex){SetPropertyValue(new EscherSimpleProperty(EscherProperties.FILL__PATTERNTEXTURE, false, true, pictureIndex));SetPropertyValue(new EscherSimpleProperty(EscherProperties.FILL__FILLTYPE, false, false, FILL_TYPE_PICTURE));EscherBSERecord bse = ((HSSFWorkbook)((HSSFPatriarch)Patriarch).Sheet.Workbook).Workbook.GetBSERecord(pictureIndex);bse.Ref = (bse.Ref + 1);}