How to hide/disable existing menu items ?

Is it possible to hide/disable existing menu items like GameObjects/UI,GameObjects/2D Object etc…

I can’t seem to find anything about this.

Thanks in advance.

yes it’s possible
its an example :

var MainCan : Canvas;
var Slider : UI.Slider;

function Start () {
//this will show or hide your canvas
	MainCan.enabled = true;
// this will active or deactivate your slider
Slider.IsActive = false;

}

you can also see :
Scripting API > UnityEngine > UnityEngine.UI > Classes

http://docs.unity3d.com/ScriptReference/UI.Button.html

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