PageableImageControlViewModel_2.cs

private SmartObservableCollection<ImageViewModel> _pageableImages;

public SmartObservableCollection<ImageViewModel> PageableImages
{
    get
    {
        if (_pageableImages == null)
        {
            _pageableImages = new SmartObservableCollection<ImageViewModel>();
            _images.CollectionChanged += (s, e) => OnPropertyChanged();
        }
        return _pageableImages;
    }
}

private int _pageSize;

/// <summary>
/// Gets or sets the number of images for a single page.
/// </summary>
/// <value>
/// The number of images for a single page.
/// </value>
public int PageSize
{
    get { return _pageSize; }
    set
    {
        if (_pageSize != value)
        {
            _pageSize = value;
            OnPropertyChanged();
        }
    }
}