private void createContent(WritableSheet sheet) throws WriteException,
      RowsExceededException {
    // Write a few number
    for (int i = 1; i < 10; i++) {
      // First column
      addNumber(sheet, 0, i, i + 10);
      // Second column
      addNumber(sheet, 1, i, i * i);
    }
    // Lets calculate the sum of it
    StringBuffer buf = new StringBuffer();
    buf.append("SUM(A2:A10)");
    Formula f = new Formula(0, 10, buf.toString());
    sheet.addCell(f);
    buf = new StringBuffer();
    buf.append("SUM(B2:B10)");
    f = new Formula(1, 10, buf.toString());
    f.setCellFormat(bgBlue);
    sheet.addCell(f);

    // now a bit of text
    for (int i = 12; i < 20; i++) {
      // First column
      addLabel(sheet, 0, i, "Boring text " + i);
      // Second column
      addLabel(sheet, 1, i, "Another text");
    }
  }