Turn off GUI in spawned Prefab

I have a scene with a button that spawns a Prefab.
Within that Prefab is a 3D model and some GUI.
I want to be able to turn off the prefabs GUI by pressing a button in the main scene but can't seem to get it working.
I tried tagging the Prefab then referring to that in the script in order to find the GUI, but although I'm not getting an error message, its not turning the GUI off either
This is the script I'm using:

Code (CSharp):

1. public GameObject[] buttons;
2.  
3. public void TurnOff(){
4.     if (buttons == null)
5.             buttons = GameObject.FindGameObjectsWithTag("InfoBox");
6. foreach (GameObject respawn in buttons) {
7.     respawn.GetComponentInChildren<CanvasGroup>().alpha = 0f;
8.     }
9. }

 

I spend all day working on this and as soon as I post a question, I work it out!

For anyone else this might help, here's the solution:

Code (CSharp):

1. private GameObject buttons;
2.  
3. public TurnOff(){
4. buttons = GameObject.FindWithTag("InfoBox");
5. buttons.GetComponentInChildren<CanvasGroup>().alpha = 0f;
6. }