BrushCollection.cs

            ButtonHighlight = Brush.RadialGradientBrush(target, new RadialGradientDescription()
            {
                Center = new SlimDX.Vector2(50, 15),
                GradientSize = new SlimDX.Vector2(100, 30),
                HorizontalRadius = 50,
                VerticalRadius = 15,
                Stops = new GradientStop[]
                {
                    new GradientStop() { Color = ConvertExt.ToColor(0xF0C6E2FF), Distance = 0.0f },
                    new GradientStop() { Color = ConvertExt.ToColor(0xF0C6E2FF), Distance = 0.3f },
                    new GradientStop() { Color = ConvertExt.ToColor(0xC6E2FF), Distance = 1.0f }
                }
            }
            );