/**
  * @return $this
  */
 protected function _prepareColumns()
 {
     $this->addColumn('slider_id', ['header' => __('Slider ID'), 'type' => 'number', 'index' => 'slider_id', 'header_css_class' => 'col-id', 'column_css_class' => 'col-id']);
     $this->addColumn('title', ['header' => __('Title'), 'index' => 'title', 'class' => 'xxx', 'width' => '50px']);
     $this->addColumn('position', ['header' => __('Position'), 'index' => 'position', 'type' => 'options', 'class' => 'xxx', 'width' => '50px', 'options' => $this->_bannersliderHelper->getAvailablePositions()]);
     $this->addColumn('style_slide', ['header' => __('Slider\'s Mode'), 'index' => 'style_slide', 'class' => 'xxx', 'width' => '50px', 'type' => 'options', 'options' => $this->_bannersliderHelper->getSliderModeAvailable()]);
     $this->addColumn('status', ['header' => __('Status'), 'index' => 'status', 'type' => 'options', 'options' => Status::getAvailableStatuses()]);
     $this->addColumn('edit', ['header' => __('Edit'), 'type' => 'action', 'getter' => 'getId', 'actions' => [['caption' => __('Edit'), 'url' => ['base' => '*/*/edit'], 'field' => 'slider_id']], 'filter' => false, 'sortable' => false, 'index' => 'stores', 'header_css_class' => 'col-action', 'column_css_class' => 'col-action']);
     $this->addExportType('*/*/exportCsv', __('CSV'));
     $this->addExportType('*/*/exportXml', __('XML'));
     $this->addExportType('*/*/exportExcel', __('Excel'));
     return parent::_prepareColumns();
 }