diff --git a/examples/debugger-mockup.raku b/examples/debugger-mockup.raku
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+# ABSTRACT: Debugger UI mockup from https://github.com/japhb/Terminal-Widgets/issues/11
+
+# NOTE: This example is purely a mockup for issue #11 to assist discussion and
+#       iteration on T-W tooling that will make it easier to implement.
+
+
+use Terminal::Widgets::Events;
+use Terminal::Widgets::Simple;
+use Terminal::Widgets::SpanStyle;
+use Terminal::Widgets::I18N::Translation;
+
+
+#| A top level UI container based on Terminal::Widgets::Simple::TopLevel
+class DebuggerMockup is TopLevel {
+    method initial-layout($builder, $width, $height) {
+        my %button-style = padding-width => (0, 1, 0, 0),;
+
+        with $builder {
+            # Header
+            .plain-text(id    => 'note', color => 'bold red',
+                        style => %( set-h => 1, margin-width => (0, 0, 1, 0), ),
+                        text  => 'ONLY A VISUAL MOCKUP, CURRENTLY NOT FUNCTIONAL'),
+            .plain-text(id   => 'breadcrumbs', color => 'cyan',
+                        style => %( set-h => 1, ),
+                        text => '_T_hread 1 > _F_rame 47 > My/ClassyClass.rakumod:7'),
+
+            # Viewer panes
+            .node(
+                # Left pane
+                .node(:vertical,
+                      .plain-text(id => 'left-title', color => 'bold yellow',
+                                  style => %( set-h => 1, ),
+                                  # XXXX: Translations for PlainText widgets
+                                  text => 'Source'),
+                      .node(
+                          .log-viewer(id => 'source'),
+                          .vscroll(scroll-target => 'source'),
+                      ),
+                      .node(
+                          .hscroll(scroll-target => 'source'),
+                          .spacer(style => %(set-w => 1, set-h => 1)),
+                      ),
+                ),
+
+                .divider(line-style => 'light1', style => %( set-w => 1, )),
+
+                # Right pane
+                .node(:vertical,
+                      .plain-text(id => 'right-title', color => 'bold yellow',
+                                  style => %( set-h => 1, ),
+                                  # XXXX: Translations for PlainText widgets
+                                  text => 'Locals'),
+                      .node(
+                          .log-viewer(id => 'inspector'),
+                          .vscroll(scroll-target => 'inspector'),
+                      ),
+                      .node(
+                          .hscroll(scroll-target => 'inspector'),
+                          .spacer(style => %(set-w => 1, set-h => 1)),
+                      ),
+                ),
+            ),
+
+            # Footer
+            .node(style => %( :minimize-h, ),
+                  # Button bar
+                  .node(style => %( :minimize-w, ),
+                        .button(style => %button-style, label => ¿'Source',
+                                process-input => { $.terminal.quit }),
+                        .button(style => %button-style, label => ¿'Locals',
+                                process-input => { $.terminal.quit }),
+                        .button(style => %button-style, label => ¿'REPL',
+                                process-input => { $.terminal.quit }),
+                        .button(style => %button-style, label => ¿'Console',
+                                process-input => { $.terminal.quit }),
+                        # XXXX: Fix up translation of Breakpoints with interpolant
+                        .button(style => %button-style, label => 'Breakpoints' ~ ' (7)',
+                                process-input => { $.terminal.quit }),
+                        .button(style => %button-style, label => ¿'Help',
+                                process-input => { $.terminal.quit }),
+                        .button(style => %button-style, label => ¿'Quit',
+                                process-input => { $.terminal.quit }),
+                       ),
+                  .spacer,
+            ),
+        }
+    }
+
+    #| Handle LayoutBuilt event by filling left and right panes with mockup text
+    multi method handle-event(Terminal::Widgets::Events::LayoutBuilt:D, BubbleUp) {
+        my $source    = %.by-id<source>;
+        my $inspector = %.by-id<inspector>;
+
+        $source.add-entry: q:to/SOURCE/;
+            # Defining My::ClassyClass ...
+            # It's such a classy class,
+            # I can't even handle it,
+            # I need to say yay!
+            class My::ClassyClass {
+                method do() {
+                    say 'Yay!';
+                }
+            }
+            SOURCE
+
+        $inspector.add-entry: q:to/INSPECTOR/;
+            > $foo (Str)  = iea
+            > $!bar (Int) = 5
+            > @baz (List) = 1, 3, 5, 7, ...
+            ...
+            INSPECTOR
+
+        $source.full-refresh;
+        $inspector.full-refresh;
+    }
+}
+
+
+sub MAIN() {
+    # Boot a Terminal::Widgets::App and jump right to the form screen
+    App.new.boot-to-screen('debugger', DebuggerMockup, title => 'Debugger Mockup');
+}