public void GLWindowRenderOnce()
{
tlog.Debug(tag, $"GLWindowRenderOnce START");
string name = "myGLWindow";
Rectangle rectangle = new Rectangle(20, 20, 100, 100);
GLWindow a1 = new GLWindow(name, rectangle, true);
a1.RenderOnce();
tlog.Debug(tag, $"GLWindowRenderOnce END (OK)");
Assert.Pass("GLWindowRenderOnce");
}