_ensureElement() {
    if (!this.el) {
      const attrs = $.extend(true, {}, this.attributes)
      if (this.id) attrs.id = this.id
      if (this.className) attrs['class'] = this.className
      const $el = $(DomRecycler.create(this.tagName)).attr(attrs)
      this.setElement($el, false)
    } else { this.setElement(this.el, false) }

  }
ensures the creation of this ui component
@method _ensureElement
@private