adding the category to the admin column for a custom post type?

I have built a custom post type called article and the information given on the admin summary screen is sparse. I was able to add the featured image post thumbnail image using the http://codex.wordpress.org/Plugin_API/Action_Reference/manage_posts_custom_column from a tutorial.

However I would like to be able to get an overview of the categories and sub categories that these posts have had assigned to them on the admin page. ie adding a column for that part?

Here is the code that I have used to register the taxonomy in the custom post types code

The register_taxonomy function has a parameter called show_admin_column that will handle adding a column. Have you tried that?

eg:

register_taxonomy(
    'my_tax, 
    'post_type', 
    array(
        'label'             => 'My Taxonomy',
        'show_admin_column' => true,
        )
);