__ModularityWithMef.Desktop Sample Application__
The MefModuleManager.OnImportsSatisfied() is executing LoadModulesThatAreReadyForLoad() on line 93. Since the ModularityWithMef.Desktop application imports IModuleManager the modules are being loaded prior the Shell constructor firing.
If you remark out this line you get the following (expected) results:
Blogged in more detailed [HERE](https://www.global-webnet.net/blog/post/2014/11/06/MEF-Extension-Bug–unexpected-module-initialization.aspx)