What's this in the background?

[Michael]

Total newbie here so please be gentle.  :)

Please see the attached image...

What is that grey background?  It's not the background, i have that set to transparent.

And how do I turn it off?

Thanks!

[Michael]

Found the answer myself - this line of code turned it off:
TempoDetailChart.DefaultView.ChartArea.AxisY.StripLinesVisibility = Visibility.Collapsed;