/// <summary>
 /// Initializes a new instance of the <see cref="MultiPlayerDetailsViewModel"/> class.
 /// </summary>
 /// <param name="model">The model.</param>
 public MultiPlayerDetailsViewModel(IMultiPlayerModel model)
 {
     this.model             = model;
     model.PropertyChanged += delegate(Object sender, PropertyChangedEventArgs e){
         if (e.PropertyName == "Maze")
         {
             MultiPlayer mp = new MultiPlayer(model);
             mp.Show();
             NotifyPropertyChanged("VM_" + e.PropertyName);
         }
     };
 }