Newb Q: Changing color of plots in Flowchart.py example

[J Bones]

Hi, 

Total newbie to pyqt and pyqtgraph... I found the Flowchart.py example and it looked like it would be a useful starting point for me. I had little trouble modifying it to plot my incoming data stream in real time. Ironically, I'm finding it more difficult to simply change the color of the line in one of the initial plots. 

I understand I need to set the pen being used... somewhere. The docs lead me believe that the PlotWidget would have a PlotItem and that in turn would have a DataItem that I'd need to get a handle to in order to use setPen(). Is that about right? Is there a more straightforward way to do it? 

Thanks, 

-j