Hi David,
The easiest way to create a rounded rectangle shape is to use the basic shapes factory:
// Create a basic shapes factory
NBasicShapesFactory factory = new NBasicShapesFactory(document);
factory.DefaultSize = new NSizeF(100, 60);
// Use the factory to create a rounded rectangle shape
NShape roundedRectangle = factory.CreateShape(BasicShapes.RoundedRectangle);
roundedRectangle.Location = new NPointF(100, 100);
document.ActiveLayer.AddChild(roundedRectangle);
Best Regards,
Nevron Support Team