protected function getCellValue(Model $row, $decorator)
 {
     if (!$this->value) {
         return parent::getCellValue($row, $decorator);
     } else {
         return $this->value;
     }
 }
 public function getCustomCellAttributes(Model $row)
 {
     $attributes = parent::getCustomCellAttributes($row);
     $attributes["data-value"] = json_encode($this->presenter->FetchBoundData());
     return $attributes;
 }