protected function renderDataCellContent($model, $key, $index)
    {
        if ($this->content === null) {
            return $this->grid->formatter->format($this->getDataCellValue($model, $key, $index), $this->format);
        }

        return parent::renderDataCellContent($model, $key, $index);
    }
protected function renderDataCellContent($model, $key, $index)
    {
        if ($this->content === null) {
            return $this->grid->formatter->format($this->getDataCellValue($model, $key, $index), $this->format);
        }

        return parent::renderDataCellContent($model, $key, $index);
    }
{@inheritdoc}