def on_button_pressed(self, widget, event):
        if event.button == 1 and event.type == gtk.gdk._2BUTTON_PRESS:

            self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)
            self.window.set_title("Basic TreeView Example")

            self.musicList = gtk.TreeStore(str)
            for parent in range(4):
                piter = self.musicList.append(None, ['parent %i' % parent])
                for child in range(3):
                    self.musicList.append(piter, ['child %i of parent %i' % (child, parent)])
            self.trackView = gtk.TreeView(self.musicList)
            self.window.add(self.trackView)
            self.window.show_all()