Please, find this implemented in the "Simple Filtering" example, which is included in our package. The solution file is located in the RadControls for WPF installation folder, which typically looks like this:
C:\Program Files (x86)\Telerik\RadControls for WPF Q2 2011\Demos
This specific example is in Examples\Chart\SimpleFiltering
You can also view it online (Silverlight implementation, which is identical to the WPF one) here
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