@Override
    public String getColumnName(final int column) {
      if(column == 0){
        return UIDesignerBundle.message("column.key");
      }
      else if(column == 1){
        return UIDesignerBundle.message("column.value");
      }
      else{
        throw new IllegalArgumentException("unknown column: " + column);
      }
    }
@Override
    public String getColumnName(final int column)