How do I disable&hide the buttons in my Canvass/Menu?

For Some Reason the startB, exitB, and optionB UI Buttons does not disappear. However when I create a textUI and then add a Button Component it disappears the way I want it too using the same code. D: Additional question, how do you disable an image too since I'm planning to make a Image UI and disable it.

Code (CSharp):

1.     public Canvas OptionMenu;
2.     public Canvas StartMenu;
3.     public Button startB;
4.     public Button exitB;
5.     public Button optionB;
6.     public Text GameTitle;
7.  
8.     void Start () {
9.         OptionMenu = OptionMenu.GetComponent<Canvas> ();
10.         StartMenu = StartMenu.GetComponent<Canvas> ();
11.         startB = startB.GetComponent<Button> ();
12.         exitB = exitB.GetComponent<Button> ();
13.         optionB = optionB.GetComponent<Button> ();
14.         GameTitle = GameTitle.GetComponent<Text> ();
15.         OptionMenu.enabled = false;
16.  
17.     }
18.    
19.     void Update () {
20.    
21.     }
22.  
23.  
24.     public void StartPress()
25.     {
26.         OptionMenu.enabled = false;
27.         startB.enabled = false; //does not work the way I want to
28.         exitB.enabled = false; //does not work the way I want to
29.         optionB.enabled = false; //does not work the way I want to
30.         GameTitle.enabled = false;
31.  
32.     }

Any ideas? Thank you so much for any advice.

 

Use GameObject.SetActive(false).

 

I tried it but it does not work.

 

That's odd. As in:

Code (CSharp):

1. startB.gameObject.SetActive(false);

 

Thank you!! I just realized that I made a simple mistake.