private void TabBodyBox_D2DPaint(D2DGraphics g) { RawRectangleF rect = new RawRectangleF(0, 0, tabBodyBox.Width, tabBodyBox.Height); PathGeometry pathGeo = DrawUtils.CreateOutlineRoundRectGeometry(g, rect, 6); RawColor4 rawColor = GDIDataD2DUtils.TransToRawColor4(Color.FromArgb(255, 191, 152, 90)); SolidColorBrush brush = new SolidColorBrush(g.RenderTarget, rawColor); g.RenderTarget.FillGeometry(pathGeo, brush); }