def delete_group(group_string)
      group_elements = group(group_string)
      group_elements.each do |element|
        delete(element.tag)
      end
    end
def delete_group(group_string)
      group_elements = group(group_string)
      group_elements.each do |element|
        delete(element.tag)
      end
    end
Deletes all elements of the specified group from this parent.

 @param [String] group_string a group string (the first 4 characters of a tag string)
 @example Delete the File Meta Group of a DICOM object
   dcm.delete_group("0002")