cancel form -->
      <span ng-show="ngTagsForm.$visible">
        <br/>
        <button type="submit" class="btn btn-primary" ng-disabled="ngTagsForm.$waiting">
          Save
        </button>
        <button type="button" class="btn btn-default" ng-disabled="ngTagsForm.$waiting" ng-click="ngTagsForm.$cancel()">
          Cancel
        </button>
      </span>
    </div>
  </form>
</div>