Nifty GUI "onClickRepeat" not working in "controlDefinition" in JME3

Question

I'm trying to make an image button in Nifty GUI in JME3 but my interact events are not working. I'm running my app in android. The button seem to be drawing but the events are not working.

Here is my control:

Here is my controller:

package com.myapp.gui;

import de.lessvoid.nifty.Nifty;
import de.lessvoid.nifty.controls.Controller;
import de.lessvoid.nifty.controls.FocusHandler;
import de.lessvoid.nifty.elements.Element;
import de.lessvoid.nifty.elements.render.ImageRenderer;
import de.lessvoid.nifty.input.NiftyInputEvent;
import de.lessvoid.nifty.render.NiftyImage;
import de.lessvoid.nifty.screen.Screen;
import de.lessvoid.xml.xpp3.Attributes;
import java.util.Properties;

/**
 *
 * @author Paul
 */
public class ButtonController implements Controller {

    private Element img1;
    private Element img2;

    @Override
    public void bind(
            final Nifty nifty,
            final Screen screen,
            final Element element,
            final Properties parameter,
            final Attributes controlDefinitionAttributes) {
        img1 = element.getElements().get(0);
        img2 = element.getElements().get(1);
    }

    @Override
    public void init(Properties prprts, Attributes atrbts) {
    }

    @Override
    public void onStartScreen() {
        img1.show();
        img2.hide();
    }

    @Override
    public void onFocus(final boolean getFocus) {
    }

    @Override
    public boolean inputEvent(NiftyInputEvent inputEvent) {
        return false;
    }

    public void buttonDown() {
        img1.hide();
        img2.show();
    }

    public void buttonUp() {
        img1.show();
        img2.hide();
    }
}

Here is my screen:

And my app:

package com.myapp;

import com.jme3.app.SimpleApplication;
import com.jme3.material.Material;
import com.jme3.math.ColorRGBA;
import com.jme3.niftygui.NiftyJmeDisplay;
import com.jme3.renderer.RenderManager;
import com.jme3.scene.Geometry;
import com.jme3.scene.shape.Box;

import de.lessvoid.nifty.Nifty;
import de.lessvoid.nifty.screen.Screen;
import de.lessvoid.nifty.screen.ScreenController;

/**
 * test
 *
 * @author Serge
 */
public class Main extends SimpleApplication implements ScreenController {

    private Nifty nifty;

    public static void main(String[] args) {
        Main app = new Main();
        app.start();
    }

    @Override
    public void simpleInitApp() {

        Box b = new Box(1, 1, 1);
        Geometry geom = new Geometry("Box", b);

        Material mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
        mat.setColor("Color", ColorRGBA.Blue);
        geom.setMaterial(mat);

        rootNode.attachChild(geom);

        NiftyJmeDisplay niftyDisplay = new NiftyJmeDisplay(assetManager,
            inputManager,
            audioRenderer,
            guiViewPort);
        nifty = niftyDisplay.getNifty();

        nifty.setDebugOptionPanelColors(false);

        nifty.fromXml("Interface/screens.xml", "start", this);

        // attach the nifty display to the gui view port as a processor
        guiViewPort.addProcessor(niftyDisplay);

        // disable the fly cam
//        flyCam.setEnabled(false);
//        flyCam.setDragToRotate(true);
        inputManager.setCursorVisible(true);

    }

    @Override
    public void simpleUpdate(float tpf) {
        //TODO: add update code
    }

    @Override
    public void simpleRender(RenderManager rm) {
        //TODO: add render code
    }

    public void bind(Nifty nifty, Screen screen) {
        System.out.println("bind( " + screen.getScreenId() + ")");
    }

    public void onStartScreen() {
        System.out.println("onStartScreen");
    }

    public void onEndScreen() {
        System.out.println("onEndScreen");
    }

    public void buttonDown() {
        System.out.println("buttonDown");
    }

}

There are very few examples of making Nifty GUI controls out there, please help me out.

EDIT

So far I figured out if I do this

flyCam.setEnabled(false);
flyCam.setDragToRotate(false);

I receive the events in my controller but still can not get onClick in the app

Nifty GUI "onClickRepeat" not working in "controlDefinition" in JME3

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