Click on any item to drill-down and Ctrl+Click on any item to drill-up. The top chart uses HierarchicalData sample and the second chart uses GroupingCollection to generate a summary information from flat data.
Please note that all data is fictitious and I just cooked it up for the sample.
To get access to parent and children collections a HierarchicalCollectionView is constructed using GC/HD as source. To display a drilled down view the children collection is set as charts dataProvider. For a drill-up operation the clicked items parent collection is set as dataProvider.
The source can be downloaded from here.
I have used the DrillDown, DrillUp effects from Ely's chart drill down sample of XML data. The sample would have looked a bit dull without them. Thanks to Ely!.