_pickerToggleEventHandler(event) {
    const { target } = event;
    const isInPickerControl = target && this._isElementInColorPickerControl(target);

    if (!isInPickerControl || (isInPickerControl && this._isPaletteButton(target))) {
      this._show = !this._show;
      this.pickerControl.style.display = this._show ? 'block' : 'none';
      this._setPickerControlPosition();
      this.fire('changeShow', this);
    }
    event.stopPropagation();
  }
Picker toggle event handler
@param {object} event - change event
@private