Ok, I destroyed my brain, Google and stackoverflow, trying to figure it out, but just can't get it. I am trying to use DrawingBrush with a DrawingGroup to do two things against the background of my WPF application (latest version). First, I want RadialGradientBrush to use a subtle gradient in my background. This part works just fine. The second part that I am trying to accomplish is that I also want to repeat the diagonal lines as part of this background. I know that I can do this with an image, but rather I will use geometry as I try to learn and master WPF. Here is what I still have. The radial color seems beautiful, but there are no lines. Any help would be appreciated.
<Style x:Key="WindowBackground" TargetType="Grid">
<Setter Property="Background">
<Setter.Value>
<DrawingBrush>
<DrawingBrush.Drawing>
<DrawingGroup>
<GeometryDrawing>
<GeometryDrawing.Brush>
<RadialGradientBrush GradientOrigin="0.5,0.5" RadiusX="0.5" RadiusY="0.5">
<GradientStop Color="#EE9D40" Offset="0"/>
<GradientStop Color="#BF8230" Offset="1"/>
</RadialGradientBrush>
</GeometryDrawing.Brush>
<GeometryDrawing.Geometry>
<RectangleGeometry Rect="0,0,1,1"/>
</GeometryDrawing.Geometry>
</GeometryDrawing>
<GeometryDrawing>
<GeometryDrawing.Brush>
<DrawingBrush TileMode="Tile" Stretch="None" Viewbox="0,0,1,1" Viewport="0,0,25,25" ViewportUnits="Absolute">
<DrawingBrush.RelativeTransform>
<TranslateTransform X="0" Y="0" />
</DrawingBrush.RelativeTransform>
<DrawingBrush.Drawing>
<GeometryDrawing Brush="#20FFFFFF" Geometry="M10,0 22,0 12,25 0,22 Z" />
</DrawingBrush.Drawing>
</DrawingBrush>
</GeometryDrawing.Brush>
<GeometryDrawing.Geometry>
<RectangleGeometry Rect="0,0,1,1"/>
</GeometryDrawing.Geometry>
</GeometryDrawing>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
</Setter.Value>
</Setter>
</Style>