Extending VS project system with MEF

Hello all,

I have found that Microsoft.VisualStudio.Project.PropertyPages.PropertyPagesDataModelProvider from Microsoft.VisualStudio.Project.Core.Impl.dll (VS2012) imports many parts via ImportMany attribute. I would like to create a custom IDynamicEnumValuesProvider and an ICommandLinePreviewProvider, to export them into the VS project system, and to distribute them as a part of my extension. These interfaces (and their related metadata) are public and I'm able to compile an assembly that exports custom parts of these types. But how can I make VS import them?

Best regards,
Dmitry