def __init__(self):
        super(PreferenceDialog, self).__init__(_("Preferences"), 575, 495, 
                                               mask_type=DIALOG_MASK_MULTIPLE_PAGE,
                                               close_callback=self.hide_all)
        
        self.set_position(gtk.WIN_POS_CENTER)
        
        self.main_box = gtk.VBox()
        close_button = Button(_("Close"))
        close_button.connect("clicked", lambda w: self.hide_all())
        
        # Init widget.
        self.general_setting = GeneralSetting()
        self.hotkey_setting = HotKeySetting()
        self.desktop_lyrics_setting = DesktopLyricsSetting()
        self.scroll_lyrics_setting = ScrollLyricsSetting()
        self.plugins_manager = PluginsManager()
        
        # Category bar
        self.category_bar = TreeView(enable_drag_drop=False, enable_multiple_select=False)
        self.category_bar.set_expand_column(0)
        self.category_bar.draw_mask = self.draw_treeview_mask
        self.category_bar.set_size_request(132, 516)
        self.category_bar.connect("single-click-item", self.on_categorybar_single_click)

        # Init catagory bar.
        self.__init_category_bar()
        
        category_box = gtk.VBox()
        background_box = BackgroundBox()
        background_box.set_size_request(132, 11)
        background_box.draw_mask = self.draw_treeview_mask
        category_box.pack_start(background_box, False, False)
        
        category_bar_align = gtk.Alignment()
        category_bar_align.set(0, 0, 1, 1,)
        category_bar_align.set_padding(0, 1, 0, 0)
        category_bar_align.add(self.category_bar)
        category_box.pack_start(category_bar_align, True, True)
        
        # Pack widget.
        left_box = gtk.VBox()
        self.right_box = gtk.VBox()
        left_box.add(category_box)
        self.right_box.add(self.general_setting)
        right_align = gtk.Alignment()
        right_align.set_padding(0, 0, 10, 0)
        right_align.add(self.right_box)

        body_box = gtk.HBox()
        body_box.pack_start(left_box, False, False)
        body_box.pack_start(right_align, False, False)
        self.main_box.add(body_box)
        
        # DialogBox code.
        self.body_box.pack_start(self.main_box, True, True)
        self.right_button_box.set_buttons([close_button])        
    def __init__(self):
        super(PreferenceDialog, self).__init__(_("Preference"), 575, 495, 
                                               mask_type=DIALOG_MASK_MULTIPLE_PAGE,
                                               close_callback=self.hide_all)
        
        self.set_position(gtk.WIN_POS_CENTER)
        
        self.main_box = gtk.VBox()
        close_button = Button(_("Close"))
        close_button.connect("clicked", lambda w: self.hide_all())
        
        # Init widget.
        self.general_setting = GeneralSetting()
        self.hotkey_setting = HotKeySetting()
        self.desktop_lyrics_setting = DesktopLyricsSetting()
        self.scroll_lyrics_setting = ScrollLyricsSetting()
        
        # Category bar
        self.category_bar = TreeView(font_x_padding=20)
        self.category_bar.draw_mask = self.draw_treeview_mask
        self.general_category_item = CategoryItem(_("General"), self.general_setting)
        self.category_bar.add_item(None, self.general_category_item)
        self.category_bar.add_item(None, CategoryItem(_("Hotkeys"), self.hotkey_setting))
        lyrics_node = self.category_bar.add_item(None, CategoryItem(_("Lyrics")))
        self.category_bar.add_item(lyrics_node, CategoryItem(_("Desktop"), self.desktop_lyrics_setting))
        self.category_bar.add_item(lyrics_node, CategoryItem(_("Window"), self.scroll_lyrics_setting))
        self.category_bar.add_item(None, CategoryItem(_("About us"), AboutBox()))
        self.category_bar.connect("single-click-item", self.category_single_click_cb)
        self.category_bar.set_highlight_index(0)
        
        category_box = gtk.VBox()
        background_box = BackgroundBox()
        background_box.set_size_request(132, 11)
        background_box.draw_mask = self.draw_treeview_mask
        category_box.pack_start(background_box, False, False)
        
        category_scrolled_window = ScrolledWindow()
        category_scrolled_window.add_child(self.category_bar)
        category_scrolled_window.set_policy(gtk.POLICY_NEVER, gtk.POLICY_NEVER)
        category_scrolled_window.set_size_request(132, 516)
        
        category_scrolled_window_align = gtk.Alignment()
        category_scrolled_window_align.set(0, 0, 1, 1,)
        category_scrolled_window_align.set_padding(0, 1, 0, 0)
        category_scrolled_window_align.add(category_scrolled_window)
        
        category_box.pack_start(category_scrolled_window_align, True, True)
        
        # Pack widget.
        left_box = gtk.VBox()
        self.right_box = gtk.VBox()
        left_box.add(category_box)
        self.right_box.add(self.general_category_item.get_allocated_widget())
        right_align = gtk.Alignment()
        right_align.set_padding(0, 0, 10, 0)
        right_align.add(self.right_box)

        body_box = gtk.HBox()
        body_box.pack_start(left_box, False, False)
        body_box.pack_start(right_align, False, False)
        self.main_box.add(body_box)
        
        # DialogBox code.
        self.body_box.pack_start(self.main_box, True, True)
        self.right_button_box.set_buttons([close_button])