getRubberBandBox () {
    if (!this.rubberBandBox) {
      this.rubberBandBox =
        svgCanvas.createSVGElement({
          element: 'rect',
          attr: {
            id: 'selectorRubberBand',
            fill: '#22C',
            'fill-opacity': 0.15,
            stroke: '#22C',
            'stroke-width': 0.5,
            display: 'none',
            style: 'pointer-events:none'
          }
        })
      this.selectorParentGroup.append(this.rubberBandBox)
    }
    return this.rubberBandBox
  }
@returns {SVGRectElement} The rubberBandBox DOM element. This is the rectangle drawn by
the user for selecting/zooming