Error in having 2 App.xaml in same solution

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I have wpf mvvm project structure Like this- HomeApplication1(solution). HomeApp(project1) LoginApp(startup project) UIApp(project 2) Earliear 'HomeApp' was startup project & Startup URI="MainWindow.xaml". I addeed the loginApp project for login of users & made it as startup project . Now there are two app.xaml file in my solution. One for LoginApp & another that was there previously existing. After login screen , i have to open homeapp screen . When i am trying to call homeapp window its throwing exception. homeappWindow app=new homeappWindow; app.Show(); app.show() give exception at static resource loading. My questions are -: 1.Can we keep two app.xaml in same solution or Do i need to delete one app.xaml file from project ? If yes then where & how i will add information of that file ?   2.How to handle static resource loading if i am calling homewindow app from loginapp as I am getting error at InitializeComponent();? Any help is appreciated!