Creating Subtype of the Windows Store App

Hi,

I'm trying to create a project flavor/subtype from the C# windows store app (windows).

Because I want to customize running/debugging the project, The windows store app that is also a subtype, so i'm trying to create a subtype from another subtype. (http://msdn.microsoft.com/en-us/library/bb165341.aspx, in this link, they call it multi-level aggregation).

However, when I try to run the project, the IVsProjectFlavorCfg innerConfiguration is always null.

in the same link above, to support multi level aggregation, it is stated that we should implement IVsProjectCfgProvider, i implement it, but my implementation is never called.

Any idea or more documentation on multi level aggregation?

Regards.