New window overwrite original view

I used multi-window example, but I wanted to have a “default view” with buttons, from which I can open the new windows.

The problem is that, after I open a new window, the “default view” is overwritten, because of the Window.view(), that is used in the “main” view ( Example.view() ).

Is there a way to have both views rendered at the same time, in different windows?