g_object_set_data(G_OBJECT(priv->window), "smoothing_button", smoothing_button);
link_button = hildon_button_new_with_text (HILDON_SIZE_FINGER_HEIGHT,HILDON_BUTTON_ARRANGEMENT_VERTICAL,
g_object_set_data(G_OBJECT(priv->window), "smoothing_button", smoothing_button);
link_button = hildon_button_new_with_text (HILDON_SIZE_FINGER_HEIGHT,HILDON_BUTTON_ARRANGEMENT_VERTICAL,