X Axis Constant Line is missing

Currently the vertical line for the x-axis is only available for numeric axis. There is hack of sorts to keep the vertical line with text axis, but I have only managed to make it work with a clustered column chart. It basically involves starting off with a line chart, adding both the numeric and text fields to the axis (the order seems to be important, so the text above the numerical), adding the vertical line (while the axis displays the numerical values) and then swicthing to a clustered column chart.