Ui button doesn"t disappear [JS]

hey everibody i have a problem with unity i use Unityscript . so my problem is i can make disappear a text with the new ui but when i try to do the same for a button it doesn't work so the only think i have find is the boolean interactable but when i launch the game he is here and i don't want so this is my code

 >      import UnityEngine.UI;
 >      public var reload : Button;
 >      public var leave : Button;
 >      public var timetext : Text;
 > >     
 > >     function Start () {
 > >     timetext.enabled = false;
 > >     reload.interactable = false; // when i use enabled nothing append
 > >     leave.interactable = false;
 > >     }
 > >     function Update () {
 > >     
 > >     if (finished = true) {
 > >         timetext.enabled = true;
 > >        reload.interactable = true;
 > >        leave.interactable = true;
 > >         
 > >     }
 > >     
 > >     }

Thanks for your answer ;)