Extension Manager

import gtk.gladeimport Globalsclass ExtensionManagerDialog:	def __init__(self, parent):		self.parent = parent				self.wTree = gtk.glade.XML(Globals.GLADE_PATH, "ExtensionManagerDialog")				signals = {			"on_Close_clicked" : self.OnClose		}		self.wTree.signal_autoconnect(signals)				self.dlg = self.wTree.get_widget("ExtensionManagerDialog")		self.tree = self.wTree.get_widget("treeview1")				self.AddColumn("Enabled", 0, 'toggle')		self.AddColumn("Name", 1)		self.AddColumn("Description", 2)		self.AddColumn("Version", 3)		self.model = gtk.ListStore(bool, str, str, str)		self.tree.set_model(self.model)		for extension in Globals.AVAILABLE_EXTENSIONS:			self.model.append(extension)		self.dlg.set_transient_for(self.parent.window)		self.dlg.show()		def OnClose(self, button):		self.dlg.destroy()	def AddColumn(self, title, modelId, cell_renderer='text'):		if cell_renderer == 'toggle':			renderer = gtk.CellRendererToggle()			renderer.set_property('activatable', True)			column = gtk.TreeViewColumn(title, renderer, active=modelId)		else:			column = gtk.TreeViewColumn(title, gtk.CellRendererText(), text=modelId)		self.tree.append_column(column)