/**
  * HTML for the column, content of the <td> element.
  *
  * @param  GridField $gridField
  * @param  DataObject $record - Record displayed in this row
  * @param  string $columnName
  * @return string - HTML for the column. Return NULL to skip.
  */
 public function getColumnContent($gridField, $record, $columnName)
 {
     $field = new TextareaField('MetaDescription');
     $value = $gridField->getDataFieldValue($record, $columnName);
     $value = $this->formatValue($gridField, $record, $columnName, $value);
     $field->setName($this->getFieldName($field->getName(), $gridField, $record));
     $field->setValue($value);
     return $field->Field() . $this->getErrorMessages();
 }