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        # a colorbutton (which opens a dialogue window in
        # which we choose a color)
        self.button = Gtk.ColorButton()
        # with a default color (blue, in this instance)
        color = Gdk.RGBA()
        color.red = 0.0
        color.green = 0.0
        color.blue = 0.0
        color.alpha = 1.0
        color = self.button.set_rgba(color)

        # choosing a color in the dialogue window emits a signal
        self.button.connect("color-set", self.on_color_chosen)

        # a label
        label = Gtk.Label()
        label.set_text("Font color")

        # a grid to attach button and label
        self.grid.attach(self.button, 4, 0, 1, 1)
        self.grid.attach(label, 4, 1, 1, 1)

    def on_color_chosen(self, user_data):
        print("You chose the color: " + self.button.get_rgba().to_string())
        color = self.button.get_rgba()
        self.textview.override_color(Gtk.StateFlags.NORMAL, color)