How can I show popup of an AutoCompletationBinding

**[Original report](https://bitbucket.org/controlsfx/controlsfx/issue/677) by Hemã Vidal (Bitbucket: [hemavidal](https://bitbucket.org/hemavidal), GitHub: [hemavidal](https://github.com/hemavidal)).**

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I want to show the autocomplete list with an KeyEvent.KEY_DOWN.

How can i do this?

Ex:

```
#!java

AutoCompletionBinding autoBind = TextFields.bindAutoCompletion(noteTextField, data);

autoBind.setHideOnEscape(true);

autoBind.getCompletionTarget().setOnKeyReleased(new EventHandler() {

@Override
public void handle(KeyEvent ke) {
if (ke.getCode().equals(KeyCode.DOWN)) {
System.out.println("KEY DOWN");
autoBind.showPopup(); //I WANT TO DO THIS
}
}

});
```