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    <p>I have some working code based on the original series of blog posts. The full code is too long to post here; I've <a href="http://pastebin.com/GK9s3xBq" rel="nofollow">posted it to PasteBin</a>.</p> <p>The code in the <code>DragAdorner</code> is quite simple:</p> <pre><code>internal sealed class DragAdorner : Adorner { private readonly UIElement _child; private readonly double _xCenter; private readonly double _yCenter; private double _leftOffset; private double _topOffset; public DragAdorner(UIElement owner, UIElement child, bool useVisualBrush, double opacity) : base(owner) { if (!useVisualBrush) { _child = child; } else { var size = GetRealSize(child); _xCenter = size.Width / 2; _yCenter = size.Height / 2; _child = new Rectangle { RadiusX = 3, RadiusY = 3, Width = size.Width, Height = size.Height, Fill = new VisualBrush(child) { Opacity = opacity, AlignmentX = AlignmentX.Left, AlignmentY = AlignmentY.Top, Stretch = Stretch.None, }, }; } } protected override int VisualChildrenCount { get { return 1; } } public double LeftOffset { get { return _leftOffset + _xCenter; } set { _leftOffset = value - _xCenter; UpdatePosition(); } } public double TopOffset { get { return _topOffset + _yCenter; } set { _topOffset = value - _yCenter; UpdatePosition(); } } private static Size GetRealSize(UIElement child) { return child == null ? Size.Empty : child.RenderSize; } public void UpdatePosition(Point point) { _leftOffset = point.X; _topOffset = point.Y; UpdatePosition(); } public void UpdatePosition() { var adorner = Parent as AdornerLayer; if (adorner != null) adorner.Update(AdornedElement); } protected override Visual GetVisualChild(int index) { if (0 != index) throw new ArgumentOutOfRangeException("index"); return _child; } protected override Size MeasureOverride(Size availableSize) { _child.Measure(availableSize); return _child.DesiredSize; } protected override Size ArrangeOverride(Size finalSize) { _child.Arrange(new Rect(_child.DesiredSize)); return finalSize; } public override GeneralTransform GetDesiredTransform(GeneralTransform transform) { var result = new GeneralTransformGroup(); result.Children.Add(new TranslateTransform(_leftOffset, _topOffset)); var baseTransform = base.GetDesiredTransform(transform); if (baseTransform != null) result.Children.Add(baseTransform); return result; } } </code></pre>
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