Render child element.

Component is not able to render a child component, for example an image inside instead of a lable.

Example:

```javascript
<Switch
  checked={this.state.checked}
  onChange={this.handleChangeRadio}
  onstyle="success"
  onlabel=" "
  offlabel=" "
  offstyle="light"
  size="xs"
>
  <img src={require("../assets/link.png")} />
</Switch>;
```
