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Why is the MainWindow of my mvvm project instanced twice on startup?

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I created an mvvm wpf project (called DemoApp) which is a basic customer list/add a customer type demo project.  The project actually runs as expected except that on startup that MainWindow.xaml is instanced twice -- the first instance contains only a menu bar and the 2nd instance contains the menu bar and a couple of user controls and some hyperlinks.  The user controls all work on the 2nd instance.  I just can't figure out why the MainWindow is instanced twice. 

I am finding that the loosely coupled paradigm appears difficult to debug.  The question is -- why is the Mainwindow coming up twice (once empty of user controls and the 2nd window contains all the user controls).  Maybe I should also ask if there is a methodology/convention for debugging a loosley coupled project.

Incase anyone needs to see the code -- I uploaded a zip file containing the entire project (72kb -- .Net 4.5 framework)  here

Any suggestions appreciated how I could fix this.


Rich P




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