Using SetActive on ARFaceManager prefab child objects

Getting Started
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1

I am working on the ocean-themed interactive face filter lesson (Submission: Ocean-themed face filter - Unity Learn) and I want to implement the UI functionality using C# scripts. My goal is to be able to show and hide child objects of the ARFace’s prefab object using a script.

I created the following script that I have assigned to the first button in my UI. I am able to get the reference to myCube, and calling SetActive(false) in the Start() function seems to work, hiding the object from view on startup. However, when I tap the button, buttonTapped() does get called but nothing happens. The activeSelf property of myCube is indeed true, but I cannot see anything.

What am I doing wrong? I also tried getting the MeshRenderer component and toggling the enabled property but that does nothing. Is it because the object is a child of the ARFace’s prefab object? Am I not retaining the reference properly?

GameObject myCube;
public ARFaceManager faceManager;  // assigned from hierarchy

void Start()
{                
     Transform parentTransform = faceManager.facePrefab.transform;
     myCube = parentTransform.Find("MyCube").gameObject;
     myCube..SetActive(false);
}

public void buttonTapped() 
{
     myCube.SetActive(true);
}
2

Answered my own question. This works:

    public ARFaceManager faceManager;
    GameObject myCube;

    void Start()
    {      
        // Subscribe to face detection event
        faceManager.facesChanged += OnFacesChanged;
    }

    void OnFacesChanged(ARFacesChangedEventArgs eventArgs)
    {
        if (eventArgs.added.Count > 0)
        {
            myCube = GameObject.Find("TestCube");
        }
    }