Calling a dissector from another dissector.

Hi, im having trouble calling a dissector from another dissector. As a test, im trying to call the foo dissector, from my test dissector. The foo dissector has the following registration

proto_foo = proto_register_protocol (
    "FOO Protocol", /* name       */
    "FOO",      /* short name */
    "foo"       /* abbrev     */
    );

Meaning its abbreviation is "foo". So, in the dissector im programing, im doing the following.

I have the following global variable

static gint hf_foo_pdu_type=-1;

This is my handoff

void proto_reg_handoff_test(void)
{
    static dissector_handle_t test_handle;
    foo_handle = find_dissector("foo");
    test_handle = create_dissector_handle(dissect_test, proto_test);
    dissector_add_uint("udp.port", TEST_PORT, test_handle);
}

 The trouble im having is that foo_handle is NULL. My dissector compiles OK, but when I run wireshark, it just doesnt work, and the program shuts down.

This is how im trying to call the dissector

static void
dissect_test(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
    col_set_str(pinfo->cinfo, COL_PROTOCOL, "Test protocol");
    /* Clear out stuff in the info column */
    col_clear(pinfo->cinfo,COL_INFO);

    if (tree)
        { /* we are being asked for details */
            proto_item *ti = NULL;
            proto_tree *test_tree = NULL;
            ti = proto_tree_add_item(tree, proto_test, tvb, 0, -1, ENC_NA);
            test_tree = proto_item_add_subtree(ti, ett_test);
            proto_tree_add_item(test_tree, hf_test_uselessbyte, tvb, 0, 1, ENC_BIG_ENDIAN);
            call_dissector(foo_handle, tvb_new_subset_remaining(tvb, 1), pinfo, test_tree);
        }
}

My test protocol, has only 1 byte at the beggining (uselessbyte), and then, the rest follows my foo template. Im doing this to experiment, and to learn how to use this tools, to later apply them in a real dissector.

I havent found any help on the internet (theres nothing on README.dissector), so could you please tell me what im doing wrong?

Thanks in advance