QString tmp_display_string;
        int tmp_display_string_length = text_.length();
        for (int i = tmp_display_string_length; i > 0 ; i--){
            if(i % binaryGrouping_ == 0 && i != tmp_display_string_length){
	    tmp_display_string = tmp_display_string + " ";
          }
          tmp_display_string = tmp_display_string + text_[tmp_display_string_length - i];
	}
	text_ = tmp_display_string;