For the Navigations object...I think a user-define...

# tornadofx

[carlw]

For the Navigations object...I think a user-defined parameter is a good idea that supports a master/details pattern. Maybe something like this?
Navigations.goto( ContactsView::class ) --> opens a Stage showing the ContactsView
Navigations.goto( ContactFragment::class, 101L ) --> replaceWith() to a Fragment with a paraneter