How to create sections on a Qwt Plot

[dvez43]

Here's what I am looking to do, and I haven't really found a solution yet within the Qwt documentation.

I would like to create 2 vertical lines on a Qwt Plot. I already have the plot functionality working as well as being able to plot points on the plot.

So, in between these two lines I would like to change the background color for just that section and only that section. Once the line has been reached, I want the background color before and after the double line section to remain the same as the default background color already set.

Does anyone know if this is this possible?

p.s. the section would need to be behind the curves already created on the QwtPlot, in a way, transparent.

Thanks in advance!