Can't get mouseover to work in charts

system_migrated

I can get hyperlinks to other reports and URLs to work off a chart data point, but I'd like to show the "corresponding data element" when the user mouses over the data point on the chart. I went through the interactivity button for the y-series and selected mouseover and toggle visibility. When I run it, I get no response on mouseover. Is there a trick here? I attached a screen shot showing how I did it. I'm using BIRT 2.3.0 and IE 7.0.