src/org/tiefaces/components/websheet/utility/WebSheetUtility.java
private static int getSheetRightColFromDimension(
			final XSSFSheet xsheet) {
		CTSheetDimension dimension = xsheet.getCTWorksheet().getDimension();
		String sheetDimensions = dimension.getRef();
		if (sheetDimensions.indexOf(':') < 0) {
			return -1;
		} else {
			return CellRangeAddress.valueOf(sheetDimensions)
					.getLastColumn();
		}
	}
private static int getSheetRightColFromDimension(
			final XSSFSheet xsheet) {
		CTSheetDimension dimension = xsheet.getCTWorksheet().getDimension();
		String sheetDimensions = dimension.getRef();
		if (sheetDimensions.indexOf(':') < 0) {
			return -1;
		} else {
			return CellRangeAddress.valueOf(sheetDimensions)
					.getLastColumn();
		}
	}
return the last column of the sheet.

@param xsheet
the xsheet
@return last column number (A column will return 0).