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diff --git a/examples/full-screen/simple-demos/line-prefixes.py b/examples/full-screen/simple-demos/line-prefixes.py
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+++ b/examples/full-screen/simple-demos/line-prefixes.py
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+#!/usr/bin/env python
+"""
+An example of a BufferControl in a full screen layout that offers auto
+completion.
+
+Important is to make sure that there is a `CompletionsMenu` in the layout,
+otherwise the completions won't be visible.
+"""
+from prompt_toolkit.application import Application
+from prompt_toolkit.buffer import Buffer
+from prompt_toolkit.completion import WordCompleter
+from prompt_toolkit.filters import Condition
+from prompt_toolkit.formatted_text import HTML
+from prompt_toolkit.key_binding import KeyBindings
+from prompt_toolkit.layout.containers import Float, FloatContainer, HSplit, Window
+from prompt_toolkit.layout.controls import BufferControl, FormattedTextControl
+from prompt_toolkit.layout.layout import Layout
+from prompt_toolkit.layout.menus import CompletionsMenu
+
+LIPSUM = """
+Lorem ipsum dolor sit amet, consectetur adipiscing elit.  Maecenas
+quis interdum enim. Nam viverra, mauris et blandit malesuada, ante est bibendum
+mauris, ac dignissim dui tellus quis ligula. Aenean condimentum leo at
+dignissim placerat. In vel dictum ex, vulputate accumsan mi. Donec ut quam
+placerat massa tempor elementum. Sed tristique mauris ac suscipit euismod. Ut
+tempus vehicula augue non venenatis. Mauris aliquam velit turpis, nec congue
+risus aliquam sit amet. Pellentesque blandit scelerisque felis, faucibus
+consequat ante. Curabitur tempor tortor a imperdiet tincidunt. Nam sed justo
+sit amet odio bibendum congue. Quisque varius ligula nec ligula gravida, sed
+convallis augue faucibus. Nunc ornare pharetra bibendum. Praesent blandit ex
+quis sodales maximus."""
+
+
+def get_line_prefix(lineno, wrap_count):
+    if wrap_count == 0:
+        return HTML('[%s] <style bg="orange" fg="black">--&gt;</style> ') % lineno
+
+    text = str(lineno) + "-" + "*" * (lineno // 2) + ": "
+    return HTML('[%s.%s] <style bg="ansigreen" fg="ansiblack">%s</style>') % (
+        lineno,
+        wrap_count,
+        text,
+    )
+
+
+# Global wrap lines flag.
+wrap_lines = True
+
+
+# The layout
+buff = Buffer(complete_while_typing=True)
+buff.text = LIPSUM
+
+
+body = FloatContainer(
+    content=HSplit(
+        [
+            Window(
+                FormattedTextControl(
+                    'Press "q" to quit. Press "w" to enable/disable wrapping.'
+                ),
+                height=1,
+                style="reverse",
+            ),
+            Window(
+                BufferControl(buffer=buff),
+                get_line_prefix=get_line_prefix,
+                wrap_lines=Condition(lambda: wrap_lines),
+            ),
+        ]
+    ),
+    floats=[
+        Float(
+            xcursor=True,
+            ycursor=True,
+            content=CompletionsMenu(max_height=16, scroll_offset=1),
+        )
+    ],
+)
+
+
+# Key bindings
+kb = KeyBindings()
+
+
+@kb.add("q")
+@kb.add("c-c")
+def _(event):
+    "Quit application."
+    event.app.exit()
+
+
+@kb.add("w")
+def _(event):
+    "Disable/enable wrapping."
+    global wrap_lines
+    wrap_lines = not wrap_lines
+
+
+# The `Application`
+application = Application(
+    layout=Layout(body), key_bindings=kb, full_screen=True, mouse_support=True
+)
+
+
+def run():
+    application.run()
+
+
+if __name__ == "__main__":
+    run()