code: public void showColumn(Object columnName) {
  		for (TableColumn column : allColumns) {
  			if (column.getHeaderValue().equals(columnName)) {
  				showColumn(column);
  				break;
  			}
  		}
  	}
docs: Show a hidden column in the table.
  
  @param columnName
  the column name from the TableModel of the column to be added