[pygtk] checkboxes untoggled

[anusha k]

hello all,

i created a combobox with checkboxes.but i am not able to toggle
them.Actually i want to create multiselect combobox but landed up in this
issue.Is it possible to implement anyone of this.Thanks in advance

import gtk,gobject
class combo:
    def __init__(self):
        self.window = gtk.Window()

        self.tax_list =
gtk.ListStore(gobject.TYPE_BOOLEAN,gobject.TYPE_STRING)
        self.combobox_tax = gtk.ComboBox(self.tax_list)

        renderer = gtk.CellRendererToggle()
        renderer.set_property('activatable',True)
        renderer.connect('toggled', self.toggled_callback, self.tax_list)
        self.combobox_tax.pack_start(renderer, True)
        self.combobox_tax.add_attribute(renderer, 'active', 0)

        renderer = gtk.CellRendererText()
        self.combobox_tax.pack_start(renderer, True)
        self.combobox_tax.add_attribute(renderer, 'text', 1)

        self.tax_list.append([False,'anusha'])
        self.tax_list.append([False,'sha'])
        self.tax_list.append([False,'anu'])

        self.window.add(self.combobox_tax)
        self.window.show_all()
    def toggled_callback(cell, path, model=None):
        iter = self.tax_list.get_iter(path)
        self.tax_list.set_value(iter, 0, not cell.get_active())
if __name__ == '__main__':
    c=combo()
    gtk.main()
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