Отображение картинок (плитка)

public class FixedSizeStackPanel : Panel
{
    #region Properties
 
    #region Orientation
 
    public static readonly DependencyProperty OrientationProperty =
        DependencyProperty.Register("Orientation", typeof (Orientation), typeof (FixedSizeStackPanel), new PropertyMetadata(Orientation.Vertical, OnOrientationChanged));
 
    public Orientation Orientation
    {
        get { return (Orientation)GetValue(OrientationProperty); }
        set { SetValue(OrientationProperty, value); }
    }
 
    private static void OnOrientationChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
    {
        var fixedLengthStackPanel = (FixedSizeStackPanel)sender;
        fixedLengthStackPanel.OnOrientationChanged((Orientation)e.NewValue, (Orientation)e.OldValue);
    }
 
    private void OnOrientationChanged(Orientation newValue, Orientation oldValue)
    {
        InvalidateVisual();
    }
 
    #endregion
 
    #endregion
 
    #region Overridden members
 
    protected override Size MeasureOverride(Size availableSize)
    {
        Size itemSize = GetItemSize(availableSize);
        foreach (UIElement child in InternalChildren)
        {
            child.Measure(itemSize);
        }
        return availableSize;
    }
 
    protected override Size ArrangeOverride(Size finalSize)
    {
        Size itemSize = GetItemSize(finalSize);
        for (int i = 0; i < InternalChildren.Count; i++)
        {
            var child = InternalChildren[i];
            Point itemPosition = GetItemPosition(itemSize, i);
            var itemRect = new Rect(itemPosition, itemSize);
            child.Arrange(itemRect);
        }
        return finalSize;
    }
 
    #endregion
 
    private Size GetItemSize(Size panelSize)
    {
        switch (Orientation)
        {
            case Orientation.Horizontal:
                return new Size(panelSize.Width / InternalChildren.Count, panelSize.Height);
            case Orientation.Vertical:
                return new Size(panelSize.Width, panelSize.Height / InternalChildren.Count);
            default:
                throw new UnhandledCaseException(typeof (Orientation), Orientation);
        }
    }
 
    private Point GetItemPosition(Size itemSize, int index)
    {
        switch (Orientation)
        {
            case Orientation.Horizontal:
                return new Point(index * itemSize.Width, 0.0);
            case Orientation.Vertical:
                return new Point(0.0, index * itemSize.Height);
            default:
                throw new UnhandledCaseException(typeof (Orientation), Orientation);
        }
    }
}