title: WooCommerce: Adding a custom filter to the Product Admin area
body: <p>I've recently added a column to my Product Admin section in WooCommerce admin using the following filter and action combination: <code>manage_product_posts_columns</code>, <code>manage_product_posts_custom_column</code>. </p>
  
  <p>My question is, is there a hook that will allow me no add a filter for this column? I can't find one but I'm sure it is possible?</p>
  
  <p>Thanks</p>