maemo.org - Talk - python: TouchSelector forces to select at least one.

I can't figure out how to make TouchSelector which doesn't force you to select at least one option.

Little example I made:

Code:

import hildon, gtk



#Create window

dialog = gtk.Dialog()

dialog.connect('delete_event', gtk.main_quit)

#Create selector

selector = hildon.TouchSelector(text = True)

selector.set_column_selection_mode(hildon.TOUCH_SELECTOR_SELECTION_MODE_MULTIPLE)

for number in range(10):

        selector.append_text(str(number))

selector.select_iter(0, selector.get_model(0).get_iter(0), False)

#Create button

select = hildon.PickerButton(gtk.HILDON_SIZE_AUTO_WIDTH | gtk.HILDON_SIZE_FINGER_HEIGHT, hildon.BUTTON_ARRANGEMENT_VERTICAL)

select.set_title('Don\'t select anything!')

select.set_alignment(0,0,1,1)

select.set_selector(selector)

dialog.vbox.pack_start(select, False, False, 0)

#Draw

dialog.show_all()

gtk.main()

Thanks.