How should I structure a full screen, modal kiosk app (newbie)

[Mike South <msouth gmail com>]

I'm using Perl GTK on a debian-based distro.  My app is the only
user-visible thing running.

The app is logically organized into "screens".  A "run" screen (which is
showing most of the time), a "menu" screen (with buttons to change things),
a "help" screen (shows text describing app function).

I am an experienced perl programmer, but a complete GTK newbie.  When I
"switch screens", I hide/remove the widgets I had previously added, and
build the screen I need to show (by adding the appropriate widgets for that
screen to the window).

It's a pretty simple app, almost all of what it does is display text, so
the drawing time is not really an issue.

However, I'm pretty sure this is not how to do this.

Details of my (probably bad) current implementation:

I have a single window:

    my $window = Gtk2::Window->new('toplevel');

I set that window to full screen:

    $window->fullscreen;

Then, when I "switch screens" in the application, I remove/hide widgets
currently showing, and create and add the widgets for the current view (I'm
sorry if you just threw up in your mouth a little when reading that.)

There is no mouse or keyboard--I have to switch screens manually in
response to other things in the environment (voltage on gpio pins).

What should I be doing?  Should each "screen" of the app be its own
$window, with the widgets generated once, then ->show and ->hide on the
$windows to switch between screens?  Will multiple toplevel, fullscreen
windows coexist ok?  But, more importantly, is that "the way" to do it, as
in, the way an experienced GTK developer would do it?  Or is there
something like panes/views/whatever that are children of windows, and I
should be switching between them?

Thanks, and sorry for the complete newbieness of the question.

Pointers to documentation I may have missed in my searching are also
welcome.

mike