title: Apache POI gridline dissapear after setting new cellstyle
body: <p>I am generating HSSF style workbook.</p>
  
  <p>After creating new CellStyle my grid lines disappear. I don't want to put BorderStyle.DORDER_THIN because that is not like just grid line. I has bigger edges.
  I have tried in sheet currentSheet.setDisplayGridlines(false)</p>
  
  <p>my code:</p>
  
  <pre><code>HssfCellStyle hssfCellStyle = hssfWorkbook.createCellStyle
  Font hssfFont = this.getFontFor(rowCellStyle.cellFont)
  hssfCellStyle.setFont(hssfFont)
                 hssfCellStyle.setFillForegroundColor(rowCellStyle.backgroundColor.hssfColor.getIndex)             
  hssfCellStyle.setFillPattern(CellStyle.SOLID_FOREGROUND);
  </code></pre>
  
  <p>so this makes disappear gdi lines</p>