Do not drawing polygon with transparent fill color

This code not drawing polygon. I am drawing on D2DControl.

```cs
g.DrawPolygon(new D2DPoint[] { new D2DPoint(100, 100), new D2DPoint(150, 150),
new D2DPoint(100, 150) }, D2DColor.Black, 1.7F, D2DDashStyle.Solid, D2DColor.Transparent);
```

when I set fill color its show OK.
But I am need draw only polygon frame.
Please help me.
Paul

Start with D2DControl and the DrawPolygon call shown in the issue, then trace how D2DColor.Transparent is handled for the fill. Verify the behavior with the supplied three-point polygon and confirm that a transparent fill still renders the black outline with the requested width and dash style.

Written by the indexing model from the issue text.