PageableImageControlViewModel_6.cs

private ICommand _displayLargeImage;

/// <summary>
/// Gets the command to display the large (main) image.
/// </summary>
/// <value>
/// The command to display the large (main) image.
/// </value>
public ICommand DisplayLargeImage
{
    get
    {
        return _displayLargeImage ??
               (_displayLargeImage = new RelayCommand(SwitchImage));
    }
}

private void SwitchImage(object o)
{
    var img = o as Image;

    if (img != null)
    {
        MainImageSource = new BitmapImage(new Uri(img.Source.ToString()));
    }
}

private BitmapImage _mainImageSource;

/// <summary>
/// Gets or sets the main image source.
/// </summary>
/// <value>
/// The main image source.
/// </value>
public BitmapImage MainImageSource
{
    get { return _mainImageSource; }
    set
    {
        if (!Equals(_mainImageSource, value))
        {
            _mainImageSource = value;
            OnPropertyChanged();
        }
    }
}