I am trying to add two real-time plot curves to one plot object. The curves are created from captured voltages and are similar to oscilloscope curves. I need to show both curves on top of each other for reference. What is happening is each curve is only being displayed in half the width as each curve seems to be overwriting the other curve with a black rectangle, making half of it disappear during replots.

Here is an image:


Is there a way, with QWT, to draw two curves on top of each other without half of the curve disappearing?