Adding Listener to Toggle

Hello there, I have been trying for a couple of hours to add listeners via code to my toggle buttons in a toggle group. Here it is what I do:

 public Toggle mainMenuToggle;
 public Toggle friendsToggle;
 public Toggle leaderboardsToggle;
 
 void Start()
 {
     mainMenuToggle.onValueChanged.AddListener((value) => MainMenuToggle(value));
         friendsToggle.onValueChanged.AddListener ((value) => FriendsMenuToggle(value));
         leaderboardsToggle.onValueChanged.AddListener ((value) => LeaderBoardsMenuToggle(value));
 }
 
 public void MainMenuToggle(bool isOn)
     {
         Debug.Log ("called");
         if (isOn) 
         {
             Debug.Log ("MainMenu On");
         } 
         else 
         {
             Debug.Log ("MainMenu Off");
         }
     }
 
 public void FriendsMenuToggle(bool isOn)
     {
         if (isOn) 
         {
             Debug.Log ("Friends On");
         } 
         else 
         {
             Debug.Log ("Friends Off");
         }
     }
 
 public void LeaderBoardsMenuToggle(bool isOn)
     {
         if (isOn) 
         {
             Debug.Log ("Leaderboard On");
         } 
         else 
         {
             Debug.Log ("Leaderboard Off");
         }
     }

The functions don't seem to hook up to the toggles. I tried to hook them up manually in the editor but there is confusion with the boolean parameter so I wan to that in code.

    Thank you for your help in advance!
              Regards, Ilko!