Simulate button pressed for a Dialog

[listirer]

I have crated a Dialog via MessageBox (prompt method) and added a KeyListener to the TextField.
How can I simulate the pressed of button OK?
The onButtonPressed method of Dialog is protected...

public static MessageBox promptMessage(String title, String message,
                                   Listener<MessageBoxEvent> callback) {
final MessageBox box = MessageBox.prompt(title, message, callback);

final Button okButton = box.getDialog().getButtonById(Dialog.OK);
okButton.disable();

final TextField<String> textBox = box.getTextBox();
textBox.addKeyListener(new KeyListener() {

    @Override
    public void componentKeyPress(ComponentEvent event) {
        if (okButton.isEnabled()
                && event.getKeyCode() == KeyCodes.KEY_ENTER) {
            box.close();
        }
    }
});

box.addListener(Events.OnKeyUp, new Listener<MessageBoxEvent>() {

    @Override
    public void handleEvent(MessageBoxEvent be) {
        String value = textBox.getValue();
        if (value == null || value.trim().equals("")) {
            okButton.disable();
        } else {
            okButton.enable();
        }
    }
});
return box;
}

[sven]

Why would you like to simulate it? Cannot you use

box.getDialog().hide(okButton);

[listirer]

Thanks, It works!