Radio events
| Property | Type | Description | 
|---|---|---|
on_change | function | (optional) will be called on state changes made by the user. Returns an object { checked, value, event }. | 
Radio.Group events
| Property | Type | Description | 
|---|---|---|
on_change | function | (optional) will be called once a Radio button changes the state. Returns an object { value, event }. |