Array of random loot items inside GUI.window

Hello, i would like to create a GUI.Window which will generate random loot from an Array of items. So far i got the window working but i am struggling with generating the random loot and displaying my GUI.Buttons inside GUI.window. Could anyone pls help me to solve this problem or at least tell me what is wrong here

 #pragma strict
 //Loot window script
 
 //Inspector variables
 public var buttonWidth                        :    float = 40;
 public var buttonHeight                        :    float = 40;
 
 //Loot variables
 public var lootWindowHeight                    :    float = 90;
 public var itemsListArray                    :   Array = [1,2,3,4,5,6,7,8,9,10];
 
 
 private var _lootWindowRect                    :    Rect = new Rect(0,0,0,0);
 private static var _lootWindowID            :   int   = 1;                                                                                //ID number has to be Unique for each window
 private static var _cnt                        :   int   = 0;                                     //counter valoue for FOR LOOP
 private var _lootWindowOffSet                :   int   = 10;
 
 
 
 
 function Start () {
     //Debug.Log("Array items: " + itemsListArray);
     itemsListArray = new Array (itemsListArray);
     
     Populate();
 }
 
 function OnGUI() {
      
     _lootWindowRect = GUI.Window(_lootWindowID, new Rect(_lootWindowOffSet, Screen.height - (_lootWindowOffSet + lootWindowHeight),        //Display Loot window on a screen
      Screen.width - (_lootWindowOffSet * 2),lootWindowHeight), LootWindow, "Loot Window");
      
 }
 
 private function LootWindow(_lootWindowID) {                                
     for(; _cnt < itemsListArray.Count; _cnt++) {
         GUI.Button(new Rect(buttonWidth * _cnt, buttonHeight * _cnt, buttonWidth, buttonHeight), _cnt.ToString());
     }
 }
 
 private function Populate() {
     for(; _cnt < 10; _cnt++) {
         itemsListArray.Add(new Array(_cnt));
         //Debug.Log(_cnt + " -- " + itemsListArray);
     }
 }