src/org/tiefaces/components/websheet/TieWebSheetBean.java
public XSSFEvaluationWorkbook getWbWrapper() {
		if ((this.wbWrapper == null) && (this.getWb() != null)) {
			this.wbWrapper = XSSFEvaluationWorkbook
					.create((XSSFWorkbook) this.getWb());
		}
		return wbWrapper;
	}
public XSSFEvaluationWorkbook getWbWrapper() {
		if ((this.wbWrapper == null) && (this.getWb() != null)) {
			this.wbWrapper = XSSFEvaluationWorkbook
					.create((XSSFWorkbook) this.getWb());
		}
		return wbWrapper;
	}
Return evaluation wrapper if needed.

@return wbwrapper.