Menu help

If I add a menu path like admin/something/foo+bar, the help screen $help["foobar"] associated with this path will not be displayed, but the $help screen of the menu point above it.

Here is a test module:

<?php
function test_link($type, $node = NULL) {
if ($type == "admin" && user_access("administer users")) {

$help["overview"] = t("Test overview help");

$help["test"] = t("Test");
$help["foobar"] = t("Foobar.");

menu("admin/test", "test", "test_admin", $help["overview"], 3);
menu("admin/test/foo+bar", "foo bar", "test_admin", $help["foobar"], 4);
}
}

function test_admin() {
$op = $_POST["op"];
$edit = $_POST["edit"];

}
?>