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public ObservableCollection<SudokuRowViewModel> Rows
{
    get
    {
        return _rows;
    }
    set
    {
        _rows = value;
        NotifyPropertyChanged(() => Rows);

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public static class ExpressionExtensions
{
    public static string GetMemberName<T>(this Expression<Func<T>> input)
    {
        if (input == null)
            return null;

        if (input.Body.NodeType != ExpressionType.MemberAccess)
            return null;

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private RelayCommand _newGameCommand;

public RelayCommand NewGame
{
    get
    {
        return _newGameCommand ?? (_newGameCommand = new RelayCommand(CreateNewBoardForCurrentLevel));
    }
}

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public class RelayCommand : ICommand
{
    private readonly Action _theCommand;
    private readonly Func<object, bool> _canExecute;

    public RelayCommand(Action theCommand, Func<object, bool> canExecute = null)
    {
        _theCommand = theCommand;
        _canExecute = canExecute;
    }

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public RelayCommand Undo
{
    get
    {
        return _undoCommand ?? (_undoCommand = new RelayCommand(UndoAction, o => _remembrall.HasActions));
    }
}

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<ItemsControl ItemsSource="{Binding Rows}"
      Grid.Column="1"
          HorizontalAlignment="Center">

...

<Popup HorizontalAlignment="Center" 
   VerticalAlignment="Center" 
   VerticalOffset="-150" 
   HorizontalOffset="-100" 

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public class MainViewModel
{
    private readonly INavigate _navigationService;
    private RelayCommand _startNewEasyGameCommand;
    private RelayCommand _startNewIntermediateGameCommand;
    private RelayCommand _startNewHardGameCommand;
    private RelayCommand _showRulesCommand;

    public MainViewModel(INavigate navigationService)
    {

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public interface INavigate
{
    void NavigateTo<TViewModel>() where TViewModel : class;
    void NavigateTo<TViewModel, TRequest>(TRequest request) where TViewModel : class;
    void GoBack();
}

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public class WindowsStoreNavigator : INavigate
{
    private readonly Frame _frame;
    private readonly IKnowWhereYourViewIs _viewLocator;
    private readonly ICreateInstances _ioc;

    public WindowsStoreNavigator(Frame frame, IKnowWhereYourViewIs viewLocator, ICreateInstances ioc)
    {
        _frame = frame;
        _viewLocator = viewLocator;

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public interface IHandle<TRequest>
{
    void Handle(TRequest request);
}