How to use the devextreme/events.off function in devextreme

private _subscribeOnElementRemoval(element: Element): void {
        events.off(element, DX_REMOVE_EVENT, this._onDxRemove);
        events.one(element, DX_REMOVE_EVENT, this._onDxRemove);
    }

getElementRef = ref => {
    if (this.elementRef) {
      events.off(this.elementRef, 'dxclick');
    }

    this.elementRef = ref;
    events.on(this.elementRef, 'dxclick', e => {
      this.props.openMenu(e);
    });
  };

ngOnDestroy() {
    events.off(this.elementRef.nativeElement, 'dxclick');
  }
}