title: Adding border to a merged region in POI XSSF workbook
body: <p>I'm using apache poi 3.7 and I need to put border to a range of cells or merged region.</p>
  
  <p>how can I to apply border to a merged region when the sheet and workbook type is XSSF.  In HSSF type I use RegionUtil-/HSSFRegionutil, but if use the first object (Regionutil) in XSSF type its doesn't works and puts a black background color to the range of cells.</p>
  
  <p>Regionutil ussually works with CellRangeAddress and i don't find information about this trouble. I don't know if the CellRangeAddres causes this.</p>