How do I create a dashed border with rounded corners in WPF?

The Rectangle element has StrokeDashArray which allows it to be drawn with dashes, but it doesn't support rounded corners. The Border control supports nice thick lines with rounded corners, but will only draw solid lines.

What's the best way to achieve a dashed border with rounded corners, with any control?

From stackoverflow

• You are mistaken that Rectangle does not support this:

  <Rectangle StrokeDashArray="0.5 1.0 0.3" Stroke="Black" StrokeThickness="2" RadiusX="10" RadiusY="10"/>
  

  

  HTH, Kent