refreshing gtk.IconView

hi all,
im trying write simple app for viewing my photo collection.
and now i have little problem. I want update IconView after
every
single loaded photo and not update after all photos loaded.
here`s source

from __future__ import with_statement
import threading
import gtk
import os   
gtk.gdk.threads_init()

class app(gtk.Window):
    def __init__(self):
        gtk.Window.__init__(self)
        self.set_title("spoView")
        self.set_default_size(400, 500)
        self.connect("destroy", gtk.main_quit)

        scroll = gtk.ScrolledWindow()
        scroll.set_border_width(2)
        scroll.set_shadow_type(gtk.SHADOW_ETCHED_IN)
        scroll.set_policy(gtk.POLICY_AUTOMATIC,
gtk.POLICY_AUTOMATIC)

        thumb_view = gtk.IconView()
        model = gtk.ListStore(str, gtk.gdk.Pixbuf)
        thumb_view.set_model(model)
        thumb_view.set_text_column(0)