So you are creating a RadChart when tooltip is displayed?
Why don't you just put the data later (when it becomes available) in ItemsSource of the drilled-down chart? The chart will re-render with the new data.
An additional limitation to this scenario, which needs to be mentioned, is that Silverlight only supports asynchronous communication with the service. Additionally, there is no api to show the tooltip for the chart progranatically.
Let me know if I am leaving something out.
Evgeni "Zammy" Petrov
the Telerik team
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