var $modalElement = this.$element;
$(document).on('focusin.modal', function (e) {
  var $parent = $(e.target.parentNode);
  if ($modalElement[0] !== e.target && !$modalElement.has(e.target).length
      // add whatever conditions you need here:
    &&
    !$parent.hasClass('cke_dialog_ui_input_select') && !$parent.hasClass('cke_dialog_ui_input_text')) {
    $modalElement.focus()
  }
})