background color for frequency analysis window

I realize that there isn't a user interface to allow me to change the background of the frequency analysis window like can be done for in the waveform background but is there a setting in a file such as the ApplicationSettings.xml file that can be manually edited.  I see multiple fields of type "ColorRGBA" that look promising, but nothing in the Frequency analysis section of the file.  If not this file, any other one that might have the background color setting for the frequency analysis?  I like to use a graphic produced by cropping down a screen print and prefer a white background for my graphs.