G_CALLBACK (on_separators_custom_entry_notify), ia);
g_signal_connect (p->custom_cb, "toggled",
G_CALLBACK (on_separators_custom_cb_toggle), ia);
G_CALLBACK (on_separators_custom_entry_notify), ia);
g_signal_connect (p->custom_cb, "toggled",
G_CALLBACK (on_separators_custom_cb_toggle), ia);