[pygtk] ListStore question

[euoar]

I'm learning the use of liststores and treeviews. I have wrotten this 
litle class as exercice:

#!/usr/bin/env python
#-*- coding: iso-8859-15 -*-

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

class BasicTreeViewExample:

    def __init__(self):
        # Create a new window
        self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)
        self.scrolled_window = gtk.ScrolledWindow(hadjustment=None, 
vadjustment=None)
        self.window.set_title("ejemplo")
        self.window.set_size_request(600, 400)
        self.window.connect("delete_event", self.delete_event)

        # create a TreeStore with one string column to use as the model
        self.liststore = gtk.ListStore(str)
        # create the TreeView using liststore
        self.treeview = gtk.TreeView(self.liststore)
        self.scrolled_window.add(self.treeview)
        self.window.add(self.scrolled_window)
        self.window.show_all()

    # close the window and quit
    def delete_event(self, widget, event, data=None):
        gtk.main_quit()
        return False

    # name is the name of the new column to add, values is a tuple with 
the values to add
    def add_result (self, name, values):
        self.iter = self.liststore.append(values[0])
        for value in values:
            self.liststore.insert_after(self.iter,  value)
        self.tvcolumn = gtk.TreeViewColumn(name)
        # add tvcolumn to treeview
        self.treeview.append_column(self.tvcolumn)
        # create a CellRendererText to render the data
        self.cell = gtk.CellRendererText()
        # hacerlo editable y conectarlo al evento de edición
        self.cell.set_property('editable', True)
        self.cell.connect('edited', self.editado, self.liststore)
        # add the cell to the tvcolumn and allow it to expand
        self.tvcolumn.pack_start(self.cell, True)
        # set the cell "text" attribute to column 0 - retrieve text
        # from that column in treestore
        self.tvcolumn.add_attribute(self.cell, 'text', 0)
        # Allow sorting on the column
        self.tvcolumn.set_sort_column_id(0)
        self.window.show_all()

    # close the window and quit
    def delete_event(self, widget, event, data=None):
        gtk.main_quit()
   
    def editado(self, cell, path, new_text, modelo):
        modelo[path][0] = new_text

def main():
    gtk.main()

if __name__ == "__main__":
    tvexample = BasicTreeViewExample()
    valores = ['a', "4222"]
    tvexample.add_result("columna", valores)
    main()

The problm with is in the list with values that I pass to the method 
add_result(). It admits only values with one char (example: "1", "4"). 
For any other value ("11", "44") it throws this exception: ValueError: 
row sequence has wrong length.

I'm trying to understand where is my mistake, but unsucessfull. Any help 
would be very apreciated.

In advance, thank you very much for your answers.

	
	
		
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