How to use the ginga.gw.Widgets.Label function in ginga

self.msg_font = self.fv.get_font('fixed', 12)

        vbox.add_widget(Widgets.Label("Output:"))
        tw = Widgets.TextArea(wrap=True, editable=False)
        tw.set_font(self.msg_font)
        tw.set_limit(self.histlimit)
        self.hist_w = tw

        vbox2 = Widgets.VBox()
        vbox2.add_widget(tw, stretch=1)
        vbox2.add_widget(Widgets.Label(''), stretch=0)

        vbox.add_widget(vbox2, stretch=1)

        vbox2 = Widgets.VBox()
        vbox2.add_widget(Widgets.Label("Type command here:"))
        self.cmd_w = Widgets.TextEntry()
        self.cmd_w.set_font(self.msg_font)
        vbox2.add_widget(self.cmd_w, stretch=0)
        self.cmd_w.add_callback('activated', self.exec_cmd_cb)
        vbox.add_widget(vbox2, stretch=0)

        btns = Widgets.HBox()
        btns.set_spacing(4)
        btns.set_border_width(4)

        btn = Widgets.Button("Close")
        btn.add_callback('activated', lambda w: self.close())
        btns.add_widget(btn)
        btn = Widgets.Button("Help")
        btn.add_callback('activated', lambda w: self.help())
        btns.add_widget(btn, stretch=0)

vbox = Widgets.VBox()

        menubar = Widgets.Menubar()
        clockmenu = menubar.add_name('Clock')
        item = clockmenu.add_name("Quit")
        item.add_callback('activated', lambda *args: self.quit())
        vbox.add_widget(menubar, stretch=0)

        self.grid = Widgets.GridBox()
        self.grid.set_border_width(1)
        self.grid.set_spacing(2)
        vbox.add_widget(self.grid, stretch=1)

        hbox = Widgets.HBox()

        self.timezone_label = Widgets.Label('TimeZone')
        self.county_timezone = Widgets.ComboBox(editable=True)

        # make a giant list of time zones
        zones = [timezone for timezones in pytz.country_timezones.values()
                 for timezone in timezones]
        zones.sort()
        for timezone in zones:
            self.county_timezone.append_text(timezone)

        # also let user set timezone by UTC offset
        self.location_label = Widgets.Label('Location')
        self.location = Widgets.TextEntry()
        self.location.set_tooltip("Type a label to denote this UTC offset")
        #self.location.set_length(10)
        self.timeoffset_label = Widgets.Label('UTC Offset(hour)')
        self.time_offset = Widgets.SpinBox(dtype=float)

b.save_path.add_callback('activated', lambda *args: self.save_as_cb())
        vbox.add_widget(w, stretch=0)

        top.add_widget(vbox, stretch=1)

        btns = Widgets.HBox()
        btns.set_border_width(4)
        btns.set_spacing(4)

        btn = Widgets.Button("Close")
        btn.add_callback('activated', lambda w: self.close())
        btns.add_widget(btn)
        btn = Widgets.Button("Help")
        btn.add_callback('activated', lambda w: self.help())
        btns.add_widget(btn, stretch=0)
        btns.add_widget(Widgets.Label(''), stretch=1)

        top.add_widget(btns, stretch=0)

        container.add_widget(top, stretch=1)
        self.gui_up = True

btn = Widgets.CheckBox("Record Picks automatically")
        btn.set_state(self.do_record)
        btn.add_callback('activated', self.record_cb)
        btns.add_widget(btn)
        btn = Widgets.Button("Clear Log")
        btn.add_callback('activated', lambda w: self.clear_pick_log_cb())
        btns.add_widget(btn)
        btns.add_widget(Widgets.Label(''), stretch=1)
        vbox3.add_widget(btns, stretch=0)

        btns = Widgets.HBox()
        btns.set_spacing(4)
        btn = Widgets.Button("Save table")
        btn.add_callback('activated', self.write_pick_log_cb)
        btns.add_widget(btn)
        btns.add_widget(Widgets.Label("File:"))
        ent = Widgets.TextEntry()
        report_log = self.settings.get('report_log_path', None)
        if report_log is None:
            report_log = "pick_log.fits"
        ent.set_text(report_log)
        ent.set_tooltip('File type determined by extension')
        self.w.report_log = ent
        btns.add_widget(ent, stretch=1)
        vbox3.add_widget(btns, stretch=0)

        nb.add_widget(vbox3, title="Report")

        fr.set_widget(nb)

        box.add_widget(fr, stretch=5)
        paned.add_widget(sw)

auto_scroll = self.settings.get('auto_scroll', False)
        b.auto_scroll.set_state(auto_scroll)
        vbox.add_widget(w, stretch=0)

        if self.settings.get('closeable', False):
            btns = Widgets.HBox()
            btns.set_border_width(4)
            btns.set_spacing(4)

            btn = Widgets.Button("Close")
            btn.add_callback('activated', lambda w: self.close())
            btns.add_widget(btn)
            btn = Widgets.Button("Help")
            btn.add_callback('activated', lambda w: self.help())
            btns.add_widget(btn, stretch=0)
            btns.add_widget(Widgets.Label(''), stretch=1)
            vbox.add_widget(btns, stretch=0)

        container.add_widget(vbox, stretch=1)

        self.gui_up = True

def gui_delete_window(self, tabname):
        lbl = Widgets.Label("Really delete window '%s' ?" % (tabname))
        dialog = Widgets.Dialog(title="Delete Window",
                                flags=0,
                                buttons=[['Cancel', 0], ['Ok', 1]],
                                parent=self.w.root)
        dialog.add_callback('activated',
                            lambda w, rsp: self.delete_tab_cb(w, rsp, tabname))

        box = dialog.get_content_area()
        box.add_widget(lbl, stretch=0)

        self.ds.show_dialog(dialog)

if have_mencoder:
            captions = [("Start:", 'label', "Start Slice", 'entry',
                         "End:", 'label', "End Slice", 'entry',
                         'Save Movie', 'button')]
            w, b = Widgets.build_info(captions, orientation=orientation)
            self.w.update(b)
            b.start_slice.set_tooltip("Starting slice")
            b.end_slice.set_tooltip("Ending slice")
            b.start_slice.set_length(6)
            b.end_slice.set_length(6)
            b.save_movie.add_callback(
                'activated', lambda w: self.save_movie_cb())
            b.save_movie.set_enabled(False)
            fr.set_widget(w)
        else:
            infolbl = Widgets.Label()
            infolbl.set_text("Please install 'mencoder' to save as movie")
            fr.set_widget(infolbl)
        vbox.add_widget(fr, stretch=0)

        # spacer = Widgets.Label('')
        # vbox.add_widget(spacer, stretch=1)

        top.add_widget(sw, stretch=1)

        btns = Widgets.HBox()
        btns.set_spacing(4)

        btn = Widgets.Button("Close")
        btn.add_callback('activated', lambda w: self.close())
        btns.add_widget(btn)
        btn = Widgets.Button("Help")

box.set_border_width(6)
        if len(l_img) < 12:
            text = Widgets.Label("\n".join(l_img))
        else:
            text = Widgets.TextArea(wrap=None)
            text.set_text("\n".join(l_img))
        box.add_widget(text, stretch=1)

        if action != 'remove':
            hbox = Widgets.HBox()
            hbox.add_widget(Widgets.Label("To channel: "))
            chnl = Widgets.ComboBox()
            for chname in self.chnames:
                chnl.append_text(chname)
            hbox.add_widget(chnl)
            hbox.add_widget(Widgets.Label(''), stretch=1)
            box.add_widget(hbox)
        else:
            chnl = None

        dialog.add_callback('activated',
                            lambda w, rsp: self.action_images_cb(w, rsp,
                                                                 chnl,
                                                                 images,
                                                                 action))

        self.fv.ds.show_dialog(dialog)

iconpath=iconpath)
            if tup[3]:
                btn.set_tooltip(tup[3])
            if tup[4]:
                btn.add_callback('activated', tup[4])

            # add to our widget dict
            self.w[Widgets.name_mangle(name, pfx='btn_')] = btn

            # add widget to toolbar
            #tb.add_widget(btn)

        hbox = Widgets.HBox()
        hbox.add_widget(tb, stretch=0)
        # stretcher
        hbox.add_widget(Widgets.Label(''), stretch=1)
        #sw.set_widget(tb)

        #top.add_widget(sw, stretch=1)

        container.add_widget(hbox, stretch=0)
        self.gui_up = True