Cannot find type System.Windows.Data.BindingExpression

In my WPF application I see an exception caused in System.Windows.Data.BindingExpression which I want to analyse. But I cannot find the type in dotPeek 1.0. How can I make it add the default assemblies for WPF 4.0? The System.Windows assembly doesn't seem to be listed in the GAC assemblies.

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