By default, summary values are automatically aggregated on parent tasks based on child tasks in Gantt Chart enabled controls within Gantt Chart Light Library. How can this behavior be disabled, and set up the parent tasks to be displayed as standard tasks in the chart area?
You can disable the automatic summary value aggregation feature by setting GanttChartItem.IsSummaryEnabled to false on the parent item that you want to behave as a standard item in the user interface. Note, though, that any upper parent task in the hierarchy that still has IsSummaryEnabled property set to true will no longer follow the child items of the summary disabled item (i.e. hierarchy breaks at that level).