diff --git a/source/Trek-12/Models/Game/Map.cs b/source/Trek-12/Models/Game/Map.cs
index 56dbb69..e1399bb 100644
--- a/source/Trek-12/Models/Game/Map.cs
+++ b/source/Trek-12/Models/Game/Map.cs
@@ -1,4 +1,6 @@
-namespace Models.Game
+using System.Collections.ObjectModel;
+
+namespace Models.Game
 {
 
     /// <summary>
@@ -19,7 +21,8 @@
         /// <summary>
         /// It is the grid of the possible operation in the game
         /// </summary>
-        public List<OperationCell> OperationGrid { get; private set; }
+        public ReadOnlyObservableCollection<OperationCell> OperationGrid { get; private set; }
+        ObservableCollection<OperationCell> operationGrid = new ObservableCollection<OperationCell>();
 
         /// <summary>
         /// It is a list of a list containing user's rope paths in the current game
@@ -39,7 +42,8 @@
         {
             Boards = InitializeBoards();
             Background = background;
-            OperationGrid = InitializeOperationGrid();
+            OperationGrid = new ReadOnlyObservableCollection<OperationCell>(operationGrid);
+            InitializeOperationGrid(operationGrid);
             RopePaths = new List<List<Cell>>();
             Zones = new List<List<Cell>>();
         }
@@ -62,9 +66,8 @@
         /// Initializes the operation grid of the map.
         /// </summary>
         /// <returns>Return the operation grid</returns>
-        private List<OperationCell> InitializeOperationGrid()
+        private void InitializeOperationGrid(ObservableCollection<OperationCell>operationGrid)
         {
-            var operationGrid = new List<OperationCell>();
             for (int i = 0; i < 5; i++) // 5 operations
             {
                 for (int j = 0; j < 4; j++) // 4 cells per operation
@@ -72,7 +75,6 @@
                     operationGrid.Add(new OperationCell(i, j));
                 }
             }
-            return operationGrid;
         }
     }
 }
\ No newline at end of file
diff --git a/source/Trek-12/Stub/Stub.cs b/source/Trek-12/Stub/Stub.cs
index 5415afd..39a1450 100644
--- a/source/Trek-12/Stub/Stub.cs
+++ b/source/Trek-12/Stub/Stub.cs
@@ -11,8 +11,8 @@ namespace Stub
 
         public Stub()
         {
-            ListMap = new ReadOnlyObservableCollection<Map>(listmap);
             LoadMap();
+            ListMap = new ReadOnlyObservableCollection<Map>(listmap);
         }
 
         public void LoadMap() { 
diff --git a/source/Trek-12/Trek-12/Views/PageBoard.xaml b/source/Trek-12/Trek-12/Views/PageBoard.xaml
index 6b2f4a4..2b791c2 100644
--- a/source/Trek-12/Trek-12/Views/PageBoard.xaml
+++ b/source/Trek-12/Trek-12/Views/PageBoard.xaml
@@ -5,8 +5,8 @@
              Title="Board">
     <Grid RowDefinitions="*,auto">
         <Grid ColumnDefinitions="*,auto">
-            <CollectionView ItemsSource="{Binding ListMap.OperationGrid}"
-                            ItemsLayout="HorizontalGrid,4"
+            <CollectionView ItemsSource="{Binding ListMap[0].OperationGrid}"
+                            ItemsLayout="HorizontalGrid,5"
                             Grid.Column="1">
                 <CollectionView.ItemTemplate>
                     <DataTemplate>