Entity/CustomField.php
public function setCustomFieldsGroup(\Chill\CustomFieldsBundle\Entity\CustomFieldsGroup $customFieldGroup = null)
    {
        $this->customFieldGroup = $customFieldGroup;

        return $this;
    }
public function setCustomFieldsGroup(\Chill\CustomFieldsBundle\Entity\CustomFieldsGroup $customFieldGroup = null)
    {
        $this->customFieldGroup = $customFieldGroup;

        return $this;
    }
Set customFieldGroup

@param \Chill\CustomFieldsBundle\Entity\CustomFieldsGroup $customFieldGroup

@return CustomField