Adding New Product_types

[davico]

hello
im trying to add a new product type to zen 1.3.9a
for now i only testing admin side and dident done nothing with catalog side.
the things i have done till now :

copy admin\includes\languages\english\product_music.php to admin\includes\languages\english\product_mobile.php
copy admin\includes\modules\product_music
to admin\includes\modules\product_mobile

INSERT INTO product_types  (type_name, type_handler, type_master_type, allow_add_to_cart) VALUES
("Product - Mobile Phone", "product_mobile", 1, "y");

INSERT INTO `product_type_layout` (`configuration_title`, `configuration_key`, `configuration_value`, `configuration_description`, `product_type_id`, `set_function`) VALUES
('Show Model Number', 'SHOW_PRODUCT_MOBILE_INFO_MODEL', '1', 'Display Model Number on Product Info 0= off 1= on', 6, 'zen_cfg_select_drop_down(array(array(''id''=>''1'', ''text''=>''True''), array(''id''=>''0'', ''text''=>''False'')), ');

when try to add new product to "product - mobile phone"
i get an error 404 Object not found! .
http://localhost/demo/admin/product_...on=new_product

can someone help me solve this ?