From MainWindow to A new Window?

[TheUninvited]

I would like to load a new window?

In unity3d we used SceneLoad so we could go from scene 1 to scene 2 and it was awesome , in wpf the ways that i found is just a window pop up and that's something i dont want.
for example this is not good for me ->

RestaurantMenu.Test secW = new RestaurantMenu.Test();
            this.Visibility = Visibility.Hidden;
            secW.Show();

I dont know if that helps but like the tab control system it stays the same shows different stuff