Gossip menu on item

[roc13x]

Hi,
I really want to get gossip menus working on an item, even if it means modifying the core. E.g. This script will not work:

class gossip_custom_item : public ItemScript
{
    public:

        gossip_custom_item()
            : ItemScript("gossip_custom_item")
        {
        }

        bool OnUse(Player* player, Item* item, SpellCastTargets const& /*targets*/)
        {
                        player->ADD_GOSSIP_ITEM( 2, "Example 1", GOSSIP_SENDER_MAIN, 1);
                        player->ADD_GOSSIP_ITEM( 2, "Example 2", GOSSIP_SENDER_MAIN, 2);
                        player->SEND_GOSSIP_MENU(DEFAULT_GOSSIP_MESSAGE,item->GetGUID());

                        return true;
        }

};

When right-clicked, nothing happens.
If nobody has an actual patch, could I at least find out where I should be looking to modify, as in what files?

Thanks