public ApplicationViewModel()
{
DependencyRegistration container = new DependencyRegistration();
container.Build();
about = new AboutViewModel();
home = new HomeViewModel();
orders = new OrderViewModel();
products = new ProductViewModel();
_currentWindowViewModel = products;
SetAboutVMCommand = new RelayCommand(SetAboutVM);
SetProductsVMCommand = new RelayCommand(SetProductsVM);
SetOrdersVMCommand = new RelayCommand(SetOrdersVM);
ExitCommand = new RelayCommand(Exit);
}