private void SetSelectedObject(GameObject obj)
 {
     if (null != selectedObject && obj != selectedObject)
     {
         if (selectedObject.tag == "Thumbnail")
         {
             SetObjInactiveAppearance();
         }
         else if (selectedObject.tag == "Switch")
         {
             lightSwitch.RemoveHighlight();
         }
     }
     selectedObject = obj;
 }