code: public CustomField getCustomField(FieldType field)
     {
        CustomField result = m_configMap.get(field);
        if (result == null)
        {
           result = new CustomField(field, this);
           m_configMap.put(field, result);
        }
        return result;
     }
docs: Retrieve configuration details for a given custom field.
  
  @param field required custom field
  @return configuration detail