RadChart has been replaced by RadHtmlChart, Telerik's client-side charting component. If you are considering RadChart for new development, examine the RadHtmlChart documentation and online demos first to see if it will fit your development needs. If you are already using RadChart in your projects, you can migrate to RadHtmlChart by following these articles: Migrating Series, Migrating Axes, Migrating Date Axes, Migrating Databinding, Features parity. Support for RadChart is discontinued as of Q3 2014, but the control will remain in the assembly so it can still be used. We encourage you to use RadHtmlChart for new development.
Stacked Areas 100% charts are a variation of Stacked Area charts that present values for trends as percentages, totaling to 100% for each category
To create a Vertical Stacked Area 100% Chart set the SeriesOrientationproperty to Vertical. Set the RadChart DefaultType property or ChartSeries.Type to StackedArea100.
To create a Horizontal Stacked Area 100% Chart set the SeriesOrientationproperty to Horizontal. Set the RadChart DefaultType property or ChartSeries.Type to StackedArea100.
To display the label values as percentages, change the DefaultLabelValue for each chart series from "#Y" (the numeric value for each data point) to "#%" (the percentage of each data point to the category).