_makePickerLayerElement(colorpickerElement, title) {
    const label = document.createElement('label');
    const triangle = document.createElement('div');

    this.pickerControl = document.createElement('div');
    this.pickerControl.className = 'color-picker-control';

    this.pickerElement = document.createElement('div');
    this.pickerElement.className = 'color-picker';

    label.innerHTML = title;
    triangle.className = 'triangle';

    this.pickerControl.appendChild(this.pickerElement);
    this.pickerControl.appendChild(triangle);

    colorpickerElement.appendChild(this.pickerControl);
    colorpickerElement.appendChild(this.colorElement);
    colorpickerElement.appendChild(label);
  }
Make picker layer element
@param {HTMLElement} colorpickerElement color picker element
@param {string} title picker title
@private