That is a bug in the Prism-v2 documentation. The correct attribute to use when initializing a module on demand from a configuration file is
An example of this applied can be found in the source code of the
ConfigurationModularity Quickstart, in the App.config file (the quickstart can be found in this path: ~DecompressionPath\Quickstarts\Modularity\ConfigurationModularity\ ConfigurationModularity.sln).
I will create a WorkItem in the
issue tracker to report this bug.
Please let me know if this helps.