Does anyone know how I can keep my tickmarks on my Y2 axis but get rid of the gray horizantal line that goes across at each interval? I have a column chart and a line charts and the gray horizontal lines don't always match up (Even thought I have the tickmarks set to "smart", so rather than figure out how to get them to always match, I'm trying to delete the horizontal line from the Y@ axis...but I want to keep the tickmarks values on the actual Y2 axis. Thanks!

 Dim axis4 As New AxisItem()
                axis4.OrientationType = AxisNumber.Y2_Axis
                axis4.DataType = AxisDataType.Numeric
                axis4.SetLabelAxisType = SetLabelAxisType.GroupBySeries
                axis4.Labels.ItemFormatString = "<DATA_VALUE:0.##>"
                axis4.Labels.HorizontalAlign = Drawing.StringAlignment.Near
                axis4.Labels.VerticalAlign = Drawing.StringAlignment.Center
                axis4.Labels.Orientation = TextOrientation.Horizontal
                axis4.LineColor = Drawing.Color.Black
                axis4.LineThickness = 1
                 myChartArea.Axes.Add(axis4)