This live demo demonstrates WebChart's AJAX drilldown abilities as well as data source SQL query customization based on user input.

Mousing over a data point fires an event that has the properties of the data point as one of the arguments passed to the event handler. The pop-up in the top right corner uses these properties to create customized HTML that describes the data point that is currently in focus.

Drilling down on the data point sends custom parameters to the server-side WebChart object, which uses these parameters to customize the SQL query to the data source of the chart in order to aggregate the sales data based on the view selected.