I'm having an issue with how my standard barchart is drawing - Image below:

There is a darkened line on the top and right side of the bar that I can't seem to get rid of. The only way to hide it is to use a barpen around the bar but I do not want borders around the bars - just a flat single color bar. How can I achieve this?
I have tried these properties without success
chart3DPercent = 0
asBar.BarPen.Visible = False
asBar.Shadow.Visible = False
Thanks