I need to have a stacked area chart that displays data in relative percentages not absolute values. We used Dundas charts that has this feature - I'm sure there must be a way to do the same with Infragistics.
yes, just set the ChartType to StackAreaChart or StackSplineAreaChart, and set the StackChart.StackStyle property to "Complete."
http://help.infragistics.com/Help/NetAdvantage/WinForms/2009.2/CLR2.0/html/Chart_Stacked_Area_Chart.html