How to change fill colors when creating multiple shapes using StreamGeometry in WPF

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I'm trying to use StreamGeometry in WPF to create a bunch of random shapes on the fly. I read that this was supposed to give the best performance. Unfortunately, I can't figure out how to change the color on each shape independtly. For example, int the code below:

private void CreateGraphics(){
     int NUM_SHAPES = 100;
     int RECT_MAX_WIDTH = 100;
     int RECT_MAX_HEIGHT = 100;

     StackPanel mainPanel = new StackPanel();

     // Create a StreamGeometry to use to specify myPath.
     StreamGeometry geometry = new StreamGeometry();
     geometry.FillRule = FillRule.EvenOdd;


     using (StreamGeometryContext context = geometry.Open())
     {

         for (int i = 0; i < NUM_SHAPES; i++)
         {

             // Create a path to draw a geometry with.
             Path myPath = new Path();

             // Get random height, width, position, and color.
             double width = RECT_MAX_WIDTH * RAND.NextDouble();
             double height = RECT_MAX_HEIGHT * RAND.NextDouble();
             int x = (int)(SCREEN_WIDTH * RAND.NextDouble());
             int y = (int)(SCREEN_HEIGHT * RAND.NextDouble());

             // Create a color.
             int fill_color_num = RAND.Next(1, MAX_COLORS);
             Color fill_color = Color.FromArgb(0xFF, //alpha
                             (byte)(fill_color_num & 0xFF), //red
                             (byte)((fill_color_num >> 8) & 0xFF), //green
                             (byte)((fill_color_num >> 16) & 0xFF)); //blue
             int edge_color_num = RAND.Next(1, MAX_COLORS);
             Color edge_color = Color.FromArgb(0xFF, //alpha
                             (byte)(edge_color_num & 0xFF), //red
                             (byte)((edge_color_num >> 8) & 0xFF), //green
                             (byte)((edge_color_num >> 16) & 0xFF)); //blue

             myPath.StrokeThickness = 2;
             //myPath.Stroke = Brushes.Black;
             //myPath.Fill = Brushes.Yellow;
             myPath.Stroke = new SolidColorBrush(edge_color);
             myPath.Fill = new SolidColorBrush(fill_color);

             // Set Edges.
             int left_edge = x - (int)(width / 2);
             int right_edge = x + (int)(width / 2);
             int top_edge = y - (int)(height / 2);
             int bottom_edge = y + (int)(height / 2);
             if (left_edge < 0) { left_edge = 0; }
             if (right_edge > SCREEN_WIDTH) { right_edge = SCREEN_WIDTH; }
             if (top_edge < 0) { top_edge = 0; }
             if (bottom_edge > SCREEN_HEIGHT) { bottom_edge = SCREEN_HEIGHT; }

             // Begin the triangle at the point specified. Notice that the shape is set to
             // be closed so only two lines need to be specified below to make the triangle.
             context.BeginFigure(new Point(left_edge, bottom_edge), true /*isFilled*/, true /*isClosed*/);

             // Draw a line to the next specified point.
             //context.LineTo(new Point(left_edge, top_edge), true /* is stroked */, false /* is smooth join */);
             context.LineTo(new Point(left_edge, top_edge), true /*isStroked*/, true /*isSmoothJoin*/);

             // Draw another line to the next specified point.
             //context.LineTo(new Point(right_edge, top_edge), true /* is stroked */, false /* is smooth join */);
             context.LineTo(new Point(right_edge, top_edge), true /*isStroked*/, true /*isSmoothJoin*/);

             // Draw another line to the next specified point.
             //context.LineTo(new Point(right_edge, bottom_edge), true /* is stroked */, false /* is smooth join */);
             context.LineTo(new Point(right_edge, bottom_edge), true /*isStroked*/, true /*isSmoothJoin*/);

             // Freeze the geometry (make it unmodifiable)
             // for additional performance benefits.
             geometry.Freeze();

             // Specify the shape (triangle) of the Path using the StreamGeometry.
             myPath.Data = geometry;

             // Add path shape to the UI.
             mainPanel.Children.Add(myPath);
         }
     }

    this.Content = mainPanel;
}

I was expecting that by setting the Path.Fill and Path.Stroke properties, that I would get different colors for each rectangle. It seems that I only get the last defined color applied to all the rectangles. Does anyone know how to set unique colors for each rectangle?

EDIT: I tried placing the StreamGeometry object declaration inside the for loop, as one user suggested. For some reason I only get 2 shapes. Here is the code:

private void CreateGraphics()
 {
     int NUM_SHAPES = 3;
     int RECT_MAX_WIDTH = 100;
     int RECT_MAX_HEIGHT = 100;
     StackPanel mainPanel = new StackPanel();

     for (int i = 0; i < NUM_SHAPES; i++)
     {

         // Create a StreamGeometry to use to specify myPath.
         StreamGeometry geometry = new StreamGeometry();
         geometry.FillRule = FillRule.EvenOdd;

         using (StreamGeometryContext context = geometry.Open())
         {

                 // Create a path to draw a geometry with.
             Path myPath = new Path();

             // Get random height, width, position, and color.
             double width = RECT_MAX_WIDTH * RAND.NextDouble();
             double height = RECT_MAX_HEIGHT * RAND.NextDouble();
             int x = (int)(SCREEN_WIDTH * RAND.NextDouble());
             int y = (int)(SCREEN_HEIGHT * RAND.NextDouble());

             // Create a color.
             int fill_color_num = RAND.Next(1, MAX_COLORS);
             Color fill_color = Color.FromArgb(0xFF, //alpha
                             (byte)(fill_color_num & 0xFF), //red
                             (byte)((fill_color_num >> 8) & 0xFF), //green
                             (byte)((fill_color_num >> 16) & 0xFF)); //blue
             int edge_color_num = RAND.Next(1, MAX_COLORS);
             Color edge_color = Color.FromArgb(0xFF, //alpha
                             (byte)(edge_color_num & 0xFF), //red
                             (byte)((edge_color_num >> 8) & 0xFF), //green
                             (byte)((edge_color_num >> 16) & 0xFF)); //blue

             myPath.StrokeThickness = 2;
             //myPath.Stroke = Brushes.Black;
             //myPath.Fill = Brushes.Yellow;
             myPath.Stroke = new SolidColorBrush(edge_color);
             myPath.Fill = new SolidColorBrush(fill_color);

             // Set Edges.
             int left_edge = x - (int)(width / 2);
             int right_edge = x + (int)(width / 2);
             int top_edge = y - (int)(height / 2);
             int bottom_edge = y + (int)(height / 2);
             if (left_edge < 0) { left_edge = 0; }
             if (right_edge > SCREEN_WIDTH) { right_edge = SCREEN_WIDTH; }
             if (top_edge < 0) { top_edge = 0; }
             if (bottom_edge > SCREEN_HEIGHT) { bottom_edge = SCREEN_HEIGHT; }

             // Begin the triangle at the point specified. Notice that the shape is set to
             // be closed so only two lines need to be specified below to make the triangle.
             context.BeginFigure(new Point(left_edge, bottom_edge), true /*isFilled*/, true /*isClosed*/);

             // Draw a line to the next specified point.
             //context.LineTo(new Point(left_edge, top_edge), true /* is stroked */, false /* is smooth join */);
             context.LineTo(new Point(left_edge, top_edge), true /*isStroked*/, true /*isSmoothJoin*/);

             // Draw another line to the next specified point.
             //context.LineTo(new Point(right_edge, top_edge), true /* is stroked */, false /* is smooth join */);
             context.LineTo(new Point(right_edge, top_edge), true /*isStroked*/, true /*isSmoothJoin*/);

             // Draw another line to the next specified point.
             //context.LineTo(new Point(right_edge, bottom_edge), true /* is stroked */, false /* is smooth join */);
             context.LineTo(new Point(right_edge, bottom_edge), true /*isStroked*/, true /*isSmoothJoin*/);

             // Freeze the geometry (make it unmodifiable)
             // for additional performance benefits.
             geometry.Freeze();

             // Specify the shape (triangle) of the Path using the StreamGeometry.
             myPath.Data = geometry;

             // Add path shape to the UI.
             mainPanel.Children.Add(myPath);
         }
     }

    this.Content = mainPanel;
 }