The first object in selection grid can't be activated. Why?

Essentially what I said in the title. This is my code:

 #pragma strict
 //@ExecuteInEditMode
 
 var customButton : GUIStyle;
 var confirmMenu : GUIStyle;
 var SubMenuBox1 : GUIStyle;
 var SubMenuBox2 : GUIStyle;
 var selGridInt : int = -1;
 var selGridInt2 : int = 0;
 var selStrings2 : String[] = ["Yes", "No"];
 var selStrings1 : String[] = ["Sandbox", "Multiplayer", "Options", "Exit"];
 //var MainMenu:GUISkin;
 //var Rect2 = RectOffset(0,0,10,10);
 //var sliderValue : float = 1.0;
 //private var rctOff : RectOffset;
 
 function Start(){
     
 }
 
 //#if UNITY_EDITOR #endif
 function OnGUI () {
         selGridInt = GUI.SelectionGrid (Rect (Screen.width*0.015625, Screen.height*0.014286, 75, 95), selGridInt, selStrings1, 1, customButton);
         if (selGridInt == 0){
             Application.LoadLevel("gameDemo");
         }
         
         if (selGridInt == 1){
             Application.LoadLevel("");
         }
         
         if (selGridInt == 2){
             //GUI.Box(Rect(Screen.width/2, Screen.height/2, 100, 200, "Are you sure?", confirmMenu));
             selGridInt2 = GUI.SelectionGrid (Rect (Screen.width/2, Screen.height/2, 75, 25), selGridInt2, selStrings2, 2, customButton);
             if(selGridInt2 == 1){
                 Application.LoadLevel(Application.loadedLevel);
             }
             
             //if(selGridInt2 != 1||0){
                 //System.Diagnostics.Process.GetCurrentProcess().Kill();
             //}
         }
 }