Intercept the Run method of your bootstrapper by defining a new Run method, fetch the list of modules (list trimmed to the user in question of course) and populate the catalog from this. poc code? Here you are (note I am using a custom RIA domain service to trim the list of modules) public class Bootstrapper...

Sharing code between Silverlight and WPF Applications has been a returning wish from several of the customers in our Microsoft Innovation Center in Denmark. The base class libraries are very similar, but obviously something is missing in the 3-4 MB Silverlight download you just installed on that iMac...