how to appear UI button when ImageTarget detected?

Hi i study AR about vuforia SDK in Unity
i try to when detect image target
appear some buttons and click that buttons appear another object and information
so i create button under ui, and built it
98827-q.png

i thought button will be appear when image target detected
but button were appear before detected image target

and detected image target button take a seat side of object
98829-q2.png

how i config button appear when detected image target?
and a button called some object and that object enable
other button disable until called object close(or disable activity) ?
thanks

Note: i disable activity button write Button1,Button2 and write script in 3d object under image target

public GameObject Button1;
public GameObject Button2;

// Use this for initialization
void Start () {
    Button1.SetActive(true);
    Button2.SetActive(true);

}

// Update is called once per frame
void Update () {
	
}

}

``

post by @seonho

@CSH92 I didn’t get your question Exactly, As per i understood

-Basically in Vuforia Image Target contains DefaultTrackableEventHandler script
-Find OnTackingFound Function in it
-You can either Instantiate or Enable/Disable Button in this function
-On button click event Instantiate or Enable/Disable your Object and hide button
Hope this helps

I’m sorry I can not speak English well.
In summary, i will want to see the buttons when I recognize the image and load the object into the AR

Sorry, I cant found the OnTrackingFound function. Can you snap the picture please?