please help me with AR multiple object

please help me, i wish when button "home" pressed it will only show (game object "home") "lt1" pressed it will only show (game object "lt1") "lt2" pressed it will only show (game object "lt2") i'm using setactive but it's not happen anything, please help me

 using UnityEngine;
 using System.Collections;
 public class Srisoeta : MonoBehaviour {
     
 
     public    GUISkin    guiSkin;
     public    float    guiRatio;
     public    float    sWidth;
     public    Vector3    GUIsF;
     
     public    GameObject home;
     public    GameObject lt1;
     public    GameObject lt2;
     
     void Awake(){
         sWidth = Screen.width;
         guiRatio = sWidth/1920;
         GUIsF = new Vector3(guiRatio,guiRatio,1);
     }
     void OnGUI(){
         GUI.skin = guiSkin;
 
         MultiObject ();
     }
     
     void MultiObject(){
         
 
         GUI.matrix = Matrix4x4.TRS (new Vector3 (GUIsF.x, GUIsF.y, 0), Quaternion.identity, GUIsF);
         if (GUI.Button (new Rect (20, 20, 256, 100), "home")) {
             home.SetActive (true);
             lt1.SetActive (false);
             lt2.SetActive (false);
             
         }
         
         if (GUI.Button (new Rect (20, 150, 256, 100), "lt1")) {
             home.SetActive (false);
             lt1.SetActive (true);
             lt2.SetActive (false);
             
         }
         
         if (GUI.Button (new Rect (20, 280, 256, 100), "lt2")) {
             home.SetActive (false);
             lt1.SetActive (false);
             lt2.SetActive (true);
             
         }
         
         if(GUI.Button(new Rect(20,540,256,100),"Exit")){
             Application.LoadLevel(1);
         }
         
     }
 }