def change_font_underline(underlined = false)
      validate_worksheet

      font = get_cell_font.dup
      font.set_underline(underlined)
      update_font_references(font)
    end
def change_font_underline(underlined = false)
      validate_worksheet

      font = get_cell_font.dup
      font.set_underline(underlined)
      update_font_references(font)
    end
Changes font underline settings of cell