If this feature does not exist I suggest the background of the charts in vv7 be switchable to white
This feature is currently available.
Click on Graph Settings by selecting the Wrench on the Graphs tab. Choose Theme on the left-side of the Graph Settings tab. You can choose the default Classic White theme or you can choose the Custom Theme and set the background of the graph to any color you would like.
You can also change the theme of the entire application to a White theme by selecting the General tab in Settings and
choosing the Classic skin.