Just like you can right-click on a chart and to to "Mark" or "X-Trace" mode where you can click on points on the chart and see cross-hairs and a marker, I'd like to be able to "Mark" the same point on the chart through a script using a date/time along the X-axis. Similar to the "getSelectedXValue" in the X-Trace function, I'd like to "setSelectedXValue"