I am creating a dynamic chart with a seriesdescriptorselector that changes the type of the X-axis (DateTimeContinuous or Linear) based on user defined settings. I am also setting a grid for the horizontal and vertical axis of the chart. The problem I am having is that only the horizontal lines of the grid are showing up on the chart. I get no vertical lines at all regardless of whether the horizontal axis is Linear of DateTimeContinuous. Does the use of a series descriptor selector invalidate the grid lines for the axis?