CellRenderCombo in SimpleList example and question re: go to position

[Mike Martin <redtux1 gmail com>]

Hi
I am working on getting CellRendererCombo working as I want

Code
##Setup combo column type##
Gtk2::SimpleList->add_column_type(
'combo',type=>'Glib::Scalar',renderer=>'Gtk2::CellRendererCombo',attr=>
sub{
$_[1]->set("text",$_[2]->get($_[3],$_[4]));
$_[1]->set("has_entry","TRUE");
$_[1]->set("editable","TRUE");
$_[1]->set (text_column => 1);
}

##set model##
my $title_rend=$videos_table->get_column(3)->get_cell_renderers;
$title_rend->set(model=>$title_list);

##setup row references##
$videos_table->signal_connect (cursor_changed => sub{
                        ($cell, $path_str) = @_;
                        ($path,$focus)= $videos_table->get_cursor or die print $!;
                        $row_ref = $videos_table->get_row_data_from_path ($path);
                        }
                        );


##changed signal for renderer##
$title_rend->signal_connect('changed'=>sub{
my $rend_iter=$_[2];
$title_id=$title_rend->get("model")->get_value($rend_iter,0);
$title_val=$title_rend->get("model")->get_value($rend_iter,1);
$row_ref->[2]=$title_id; ##$row_ref is set by a get_cursor call on simplelist
$row_ref->[3]=$title_val;
}
);

My  only question now is whether it is possible to set the position of
the combobox to that of the current value

eg:

values of combobox render is

1,val1
2,val2
3,val3
4,val4

current value is val3

so that when renderer is clicked val3 is selected in the popup

thanks in advance