title: Button `OnSelect` not functioning in Unity.UI Canvas situation
body: <p>I have three buttons, when you tap one button, a panel with a text appear.</p>
  
  <p>The problem is when I attached the script, nothing happens.
  The "click" is registered but the the panel never appears.</p>
  
  <p>My script is attached to each of the button and is something like this:</p>
  
  <pre><code>public GameObject panel; //i use to put the panel in unity
  bool selected = false;
  
  void Start () {    
      panel.SetActive(false); 
  }
  
  void OnSelect() {    
      selected = !selected;
      panel.SetActive(true);
  }
  </code></pre>
  
  <p>I probably have to do something else with the panel but I can't figure it out.</p>