public function dataBindColumn($sender, $param)
{
$item = $sender->getNamingContainer();
$data = $item->getData();
if (($field = $this->getDataField()) !== '') {
$value = TPropertyValue::ensureBoolean($this->getDataFieldValue($data, $field));
} else {
$value = TPropertyValue::ensureBoolean($data);
}
if ($sender instanceof TCheckBox) {
$sender->setChecked($value);
}
}