_switchClock(clockIndex) {
      const newButton = this._buttonComponent(clockIndex);
      if (this._entities.length && clockIndex < this._entities.length && newButton) {
        this._entities[this._activeIndex].active = false;
        this._activeIndex = clockIndex;
        this._entities[this._activeIndex].active = true;
        newButton.focus();
      }
    }
Switches to the specific clock by its index in _clocks property.

@param {number} clockIndex the index of the clock