title: unity3d - How to disable buttons on GUI.Box when another GUI.Box is on top?
body: <p>Here's the scenario.  I have a menu in the level that allows the user to pause the game.  When paused, a GUI.BeginGroup with GUI.Box has several buttons: resume, facebook, twitter, exit(then GUI.EndGroup()).  I show another GUI.Box on top of the pause menu when the Twitter button is tapped/selected.  </p>
  
  <p>Buttons on the pause menu are still active and I would like to disable them by either tossing up another GUI.Box before the twitter menu and just have it transparent?  Does anyone have any recommended solutions for this particluar scenario?</p>
  
  <p>Thanks in advance!</p>