How to use a view as the starting window instead of MainWindow without StartupUri ? 
## 💬 Questions and Help

in a WPF application i want to remove the MainWindow and the StartupUri and use a View as the Startup window instead. is this possible, is it related a ViewPresenter ?

right now two windows are opened the MainWindow and a ShellView which is a MvxWindow. This ShellView is the View for my Start ViewModel registered with ``` RegisterAppStart<ViewModels.ShellViewModel>(); ```
similar issue https://github.com/MvvmCross/MvvmCross/issues/181

If i remove the StartupUri from App.xaml no Window is opened and the Setup process doesn't start at all.