Can't insert picture on a XSSFWorkbook

[Felipe Issa]

Hi. I'm using apache poi 3.8 beta 5 (20111217) and i can't get it to 
insert a picture on a XSSFWorkbook. It works just fine when i try to 
insert it on a HSSFWorkbook, but when i change the type of the file it 
doesn't show anything on the sheet.  Does anyone knows how to fix this? 
Is it a bug?

Here is the code i'm using:
public void insertPicture() throws Exception{
        /*
         * 0 = HSSFWorkbook
         * anything else = XSSFWorkbook
         */
        int type = 1;

        Workbook wb = null;

        if(type == 0){
            wb = new HSSFWorkbook();
        }else{
            wb = new XSSFWorkbook();
        }
        CreationHelper createHelper = wb.getCreationHelper();

        StringBuffer sb = new StringBuffer();
        sb.append("C:\\temp\\");
        File f = new File(sb.toString());
        if (!f.isDirectory()) {
            f.mkdirs();
        }

        String dataHoje = new 
SimpleDateFormat("yyyy-MM-dd_HH-mm-ss").format(Util.getCurrentDate());
        sb.append("file_");
        sb.append(dataHoje);
        if(type == 0){
            sb.append(".xls");
        }else{
            sb.append(".xlsx");
        }


        File arquivo = new File(sb.toString());
        if (!arquivo.exists()) {
            arquivo.createNewFile();
        }

        FileOutputStream outputStream;
        Sheet sheet = null;

        try {
            outputStream =  new FileOutputStream(arquivo);
            sheet = wb.createSheet();
            Drawing patriarch= sheet.createDrawingPatriarch();
            ClientAnchor anchor = createHelper.createClientAnchor();
            anchor.setCol1(4);
            anchor.setCol2(4);
            anchor.setRow1(0);
            anchor.setRow2(0);
            anchor.setDx1(400);
            anchor.setDx2(655);
            anchor.setDy1(10);
            anchor.setDy2(200);

            anchor.setAnchorType(1);
            File pic = new File("C:\\Temp\\img_ok.png");
            long length = pic.length(  );
            byte[]picData = new byte[ ( int ) length ];
            FileInputStream picIn = new FileInputStream( pic );
            picIn.read(picData);
            int index = wb.addPicture(picData, wb.PICTURE_TYPE_PNG);
            patriarch.createPicture(anchor,index);


            wb.write(outputStream);
            outputStream.close();
        } catch (Exception e) {
            throw e;
        }
    }

Thanks in advice!

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