The Sunburst Chart control allows you to select data points by clicking or touching a sunburst slice. Use the SelectionMode property to specify whether you want to allow selection by data point or no selection at all (default). This property allows you to set the following three different selection options using the ChartSelectionModeType enumeration:

• None: Does not select any element.
• Point: Highlights the pie slice that the user clicks.
• Series: Highlights the entire pie.

When the SelectionMode is set to Point, you can change the position of the selected sunburst slice by setting the SelectedItemPosition property. Also, you can set the SelectedItemOffset property to move the selected sunburst slice away from the center. Setting the SelctionMode property to Point causes the Sunburst to update the selection property when the user clicks or touch on a sunburst slice.

• SelectedItemOffset: Specifies the offset of the selected sunburst slice from the center of the control.
• SelectedItemPosition: Specifies the position of the selected sunburst slice. The available options are Top, Bottom, Left, Right, and None (default).

The image below show how the Sunburst chart appears after you set the SelectionMode property.

The following code example demonstrates how to set these properties using C#. This examples uses the data created in the Quick Start section.

sunburst.SelectionMode = ChartSelectionModeType.Point;
sunburst.SelectedItemPosition = ChartPositionType.Top;
sunburst.SelectedItemOffset = 0.2;