So I want to try and use the bookmarks add-in. I downloaded the sample and then tried to add it into my page using the settings/add-ins but that did not seem to work. So I saw something about having to compile or something. So I opened it up in VS 2010 and noticed right away I had some reference errors with the esri assemblies. So I just added those in using the Project/Add Reference/Browse (ex C:\Program Files (x86)\ESRI SDKs\Silverlight\v2.4\ESRI.ArcGIS.Client.Toolkit.dll).
Now I get one on system.windows.interactivity. I tried to add it like the others but it was not located in the ("C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\Silverlight\v4.0\") like System.Windows.Browser.dll was. I did a search for that dll and found it (Expressions) and placed it in the folder but VS 2010 does not like it because I moved it. So then I took it out thinking I might not need it and now get a bunch of errors.
So what all am I doing wrong here. Obviously I am a newbie at this.