* otherwise just return existing object.
*
* @return - border formatting object, never returns <code>null</code>.
*/
public XSSFBorderFormatting createBorderFormatting(){
CTDxf dxf = getDxf(true);
CTBorder border;
if(!dxf.isSetBorder()) {
border = dxf.addNewBorder();
} else {
border = dxf.getBorder();
}
return new XSSFBorderFormatting(border);
}