title: How to make OpenTK.GLControl Transparent
body: <p>I am using WPF and OpenTk and I have a GLControl that is set to Transparent, the clear color is set to Transparent as well but when it draws the rectangle it becomes black. How do I make it so that it draws my rectangle on a transparent background, I have stuff behind the OpenTK.GLControl that I want to see along with the rectangle.</p>