src/org/tiefaces/components/websheet/utility/CellUtility.java
private static XSSFVMLDrawing getVmlDrawingFromCell(final Cell cell) {
		XSSFSheet sourceSheet = (XSSFSheet) cell.getSheet();
		for (POIXMLDocumentPart sourcePart : sourceSheet.getRelations()) {
			if ((sourcePart != null) && (sourcePart instanceof XSSFVMLDrawing)) {
				return (XSSFVMLDrawing) sourcePart;
			}
		}
		return null;
	}
private static XSSFVMLDrawing getVmlDrawingFromCell(final Cell cell) {
		XSSFSheet sourceSheet = (XSSFSheet) cell.getSheet();
		for (POIXMLDocumentPart sourcePart : sourceSheet.getRelations()) {
			if ((sourcePart != null) && (sourcePart instanceof XSSFVMLDrawing)) {
				return (XSSFVMLDrawing) sourcePart;
			}
		}
		return null;
	}
Find vmldrawing part according to cell.

@param cell
cell.
@return vmldrawing.