Gets or sets the chart image to view. The chart image is typically created using BaseChart.makePicture.
This property is available at runtime only.
This property is useful for charts that do not need viewport features. With this property, only the chart image is passed to the viewer, not the BaseChart object, so the BaseChart object can be freed earlier.
For charts that need viewport features (eg. for zooming and scrolling support), the ChartViewer.Chart method should be used.