/// <summary>
 /// Initializes the singleton application object.  This is the first line of authored code
 /// executed, and as such is the logical equivalent of main() or WinMain().
 /// </summary>
 public App()
 {
     this.InitializeComponent();
     this.Suspending += this.OnSuspending;
     personsViewModel = new PersonsViewModel();
     chargesViewModel = new ChargesViewModel();
 }
        public AddCharges()
        {
            this.InitializeComponent();

            chargesViewModel = (Application.Current as App).chargesViewModel;
            personsViewModel = (Application.Current as App).personsViewModel;

            this.DataContext = chargesViewModel;
            selectedPersons.DataContext = personsViewModel;
        }