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I need to create a custom shape to add on a WPF form. The shape is just a triangle. If you are wondering, yes, I can do that with a Polygon in XAML with this: <Polygon Fill="LightBlue" Stroke="Black" Name="Triangle"> <Polygon.Points> <Point X="0" Y="0"></Point> <Point X="10" Y="0"></Point> <Point X="5" Y="-10"></Point> </Polygon.Points> </Polygon> The problem is that we need to bind a property from somewhere else that ultimately determines the size of the shape. So, I wrote a simple extension of the shape class like this: public class Triangle:Shape { private double size; public static readonly DependencyProperty SizeProperty = DependencyProperty.Register("Size", typeof(Double), typeof(Triangle)); public Triangle() { } public double Size { get { return size; } set { size = value; } } protected override Geometry DefiningGeometry { get { Point p1 = new Point(0.0d,0.0d); Point p2 = new Point(this.Size, 0.0d); Point p3 = new Point(this.Size / 2, -this.Size); List<PathSegment> segments = new List<PathSegment>(3); segments.Add(new LineSegment(p1,true)); segments.Add(new LineSegment(p2, true)); segments.Add(new LineSegment(p3, true)); List<PathFigure> figures = new List<PathFigure>(1); PathFigure pf = new PathFigure(p1, segments, true); figures.Add(pf); Geometry g = new PathGeometry(figures, FillRule.EvenOdd, null); return g; } } } I thought that was good but the shape does not show up anywhere on the form. So, I am not sure if the DefiningGeometry method is well written. And if I cannot see anything very likely is not. Thanks!

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