I'm writing a gui and need to show two comboboxes in wich the second ListStore should be set according to the first combobox selection.
Anyone could help me?

Here is my code:

#programa cnec.py
#teste via pygtk

import pygtk
pygtk.require('2.0')
import gtk
import glade
import MySQLdb

class cnec:
def arquivo(self):
self.xml = gtk.glade.XML('teste.glade')


def delete(self, widget, event, data=None):
print "delete acionado"
return False

def destroy(self, widget, data=None):
print "destruido"
gtk.main_quit()

def get_active_text(combobox):
model = combobox.get_model()
active = combobox.get_active()
if active < 0:
return None
return model[active][0]

def changed_cb(combobox, widget, data=None):
sele=widget.get_active()
return sele



def __init__(self):
self.arquivo()

#definicao das consultas
con = MySQLdb.connect(host="localhost", port=3000, user="root", passwd="root", db="codificacao")
cur = con.cursor()

#criacao da janela principal
self.janela=self.xml.get_widget('window1')

#conecao de sinais da janela
self.janela.connect("destroy", self.destroy)
self.janela.connect("delete_event", self.delete)

#criacao das listas
self.lista1=gtk.ListStore(str)
self.lista2=gtk.ListStore(str)
self.lista3=gtk.ListStore(str)
self.lista4=gtk.ListStore(str)
self.lista5=gtk.ListStore(str)
self.lista6=gtk.ListStore(str)
self.lista7=gtk.ListStore(str)
self.lista8=gtk.ListStore(str)
self.lista9=gtk.ListStore(str)
self.lista10=gtk.ListStore(str)
self.lista11=gtk.ListStore(str)

cell = gtk.CellRendererText()

#criacao dos botoes
self.botao1 = self.xml.get_widget('combobox1')
self.botao2 = self.xml.get_widget('combobox2')
self.botao3 = self.xml.get_widget('combobox3')
self.botao4 = self.xml.get_widget('combobox4')
self.botao5 = self.xml.get_widget('combobox5')
self.botao6 = self.xml.get_widget('combobox6')
self.botao7 = self.xml.get_widget('combobox7')
self.botao8 = self.xml.get_widget('combobox8')
self.botao9 = self.xml.get_widget('combobox9')
self.botao10 = self.xml.get_widget('combobox10')
self.botao11 = self.xml.get_widget('combobox11')
self.sair = self.xml.get_widget('button3')

#preencher lista1
sql1='select ID from codificacao.componentes'
cur.execute(sql1)
rs1=cur.fetchall()

self.lista1
for dados in rs1:
self.lista1.append(dados)

#preencher botoes
self.botao1.set_model(self.lista1)
self.botao1.pack_start(cell, True)

#preencher lista 2


if self.botao1.get_active() == 'C':
sql2='select d2 from codificacao.conexao'
cur.execute(sql2)
rs2=cur.fetchall()

self.lista2
for dados in rs2:
self.lista2.append(dados)

self.botao2.set_model(self.lista2)
self.botao2.pack_start(cell, True)

self.sair.connect_object("clicked", gtk.Widget.destroy, self.janela)
self.botao1.connect("changed", self.changed_cb)

#mostra a interface
self.xml.signal_autoconnect(self)
self.janela.show_all()



def main(self):
gtk.main()

if __name__ == "__main__":
cnec = cnec()
cnec.main()

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