AllowCreate AND newOptionCreator not working

Hi this my code 

```
 <Select.Async
 id='bonus_code'
 name='bonus_code'
 multi={true}
 allowCreate={true}
 newOptionCreator={this.newOption.bind(this)}
 value={this.state.bonusCode}
 onChange = {this.onChangeBonusCode.bind(this)}
 loadOptions={getOptions}
/>
```

**newOptionCreator** is not working

Any ideas????
