I have a VSPackage ToolWindow, within which has a WPF control where I recently added a Blend attached behavior (Behavior<T>). This attached behavior requires System.Windows.Interactivity. Now, I get the following error at runtime, when the ToolWindow is first loaded (and fails to render controls that use the attached behavior):
Could not load file or assembly 'System.Windows.Interactivity, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
I have tried via Fusion Log Viewer and the Extension Analyzer to get more info on what additional assembly or assemblies I need to load, but I'm not finding info in either of those places.
Where can I look to find additional info to find out which additional assemblies I need to load?