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+#!/usr/bin/python
+# coding=utf-8
+
+"""Convert a simple GTK+ program to be a Sugar activity.
+
+You must convert the simple GTK+ program from exercise 17 to be a Sugar
+activity.
+
+All the other files for the activity (activity.info, setup.py, etc.) have been
+provided already; you must simply modify the code in this file to derive the
+class from sugar3.activity.activity.Activity instead of from Gtk.Window, and
+make a few other changes.
+
+ 1. Remove the “#!/usr/bin/python” line from the top of the file.
+    The first line of the file should now be “# coding=utf-8”.
+ 2. Rename the class to “Exercise18Activity”.
+ 3. Add a ‘handle’ parameter to __init__ and propagate it to the parent
+    constructor in the super() call.
+ 4. Remove the window title from the constructor super() call.
+ 5. Remove the call to set_default_size() and the window destroy callback.
+ 6. Add an activity toolbar (ToolbarBox), and add an activity button
+    (ActivityToolbarButton) and a stop button (StopButton) to it.
+ 7. Change the self.add() call to self.set_canvas().
+ 8. In a terminal, change to this directory and run ‘./setup.py dev’ to add the
+    activity to Sugar on your computer.
+ 9. In a terminal, run ‘sugar-emulator’ and test the activity.
+
+Note that the necessary ‘import’ statements have already been added to the
+file.
+
+Don't forget to document any new methods you add.
+
+Hint: The code necessary for step 6 is:
+        # Create the standard activity toolbox.
+        toolbar_box = ToolbarBox()
+        self.set_toolbar_box(toolbar_box)
+        toolbar_box.show()
+
+        main_toolbar = toolbar_box.toolbar
+
+        activity_toolbar_button = widgets.ActivityToolbarButton(self)
+        main_toolbar.insert(activity_toolbar_button, 0)
+        activity_toolbar_button.show()
+
+        stop_button = widgets.StopButton(self)
+        stop_button.show()
+        main_toolbar.insert(stop_button, -1)
+"""
+
+from gi.repository import Gtk
+from sugar3.activity import activity, widgets
+from sugar3.graphics.toolbarbox import ToolbarBox
+from sugar3.graphics.toolbutton import ToolButton
+
+
+class SimpleWindow(Gtk.Window):
+    """A simple window which displays a label and a button."""
+    def __init__(self):
+        super(SimpleWindow, self).__init__(title='Simple Window')
+
+        # Set a default size for the window.
+        self.set_default_size(200, 200)
+
+        # Set up a close handler for the window. Do not modify this.
+        self.connect('destroy', self.__window_destroy_cb)
+
+        # Add a box to the window.
+        box = Gtk.Box()
+        box.set_orientation(Gtk.Orientation.VERTICAL)
+        box.set_spacing(8)
+        box.set_border_width(8)
+        box.show()
+        self.add(box)
+
+        # Create and set up the label and button.
+        label = Gtk.Label('Initial label.')
+        label.show()
+        box.pack_start(label, True, True, 0)
+
+        button = Gtk.Button('Change Label')
+        button.show()
+        box.pack_start(button, False, True, 0)
+
+        # Connect the button callback.
+        button.connect('clicked', self.__button_clicked_cb)
+
+        # Store the label as an object variable so it can be accessed from the
+        # button callback.
+        self._label = label
+
+    def __button_clicked_cb(self, button):
+        """Callback to change the label text when the button is clicked."""
+        self._label.set_text('Final label.')
+
+    def __window_destroy_cb(self, window):
+        """Callback to quit the program when the window is closed.
+
+        Do not modify this."""
+        Gtk.main_quit()