如何在App.Xaml StartUpUri中设置视图

I have created one MVVM sample application. My solution structure is like I have 4 folders. 1st for Model, 2nd for View, 3rd for ViewModel, and 4th for HelperClasses. Currently I have only one view in View folder. I want to set my view [say FamilyView, present in View folder] in StartupUri in App.xaml file, which is by default set to MainWindow.xaml. I have created one MVVM sample application. My