Hi Wayne, <a href="http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=B123AE0CBC3E111EE034080020E74861&p_node=DZ52038&p_source=External";>Here</a> is a link to an example vi that shows you how to do it. Basically, it uses the Active Plot property and transparent plot colors to "enable/disable" certain plots.
Hope this helps! Let me know if you have any other questions! Jeremy L. National Instruments
