Chart Options are only available through the Chart Wizard when a chart is dropped on the page from the Toolbox.
If you need to modify a property which is not listed there, you can override the InitializeChartControl method in the appropriate class: TableControlRow class for charts in a repeater row, TableControl or RecordControl class for charts in records or tables outside of repeaters and on a page class in code behind for charts on the page.
This method is being called from Set…Chart method in the aforementioned classes. The chart is populated by Set…Chart method.
Configuring Application Generation Options
New Application and New Pages Options