formActionButtons() {
    const opts = this.config.opts
    return opts.actionButtons
      .map(btnData => {
        if (btnData.id && opts.disabledActionButtons.indexOf(btnData.id) === -1) {
          return this.processActionButtons(btnData)
        }
      })
      .filter(Boolean)
  }
Generates form action buttons
@return {HTMLElement[]} formActions btn-group