[AUCTeX] How to make the label ref's work?

[Adam Johnson]

Hey,

I defined some new environments for Definition, Theorem, etc. as below in my 
.emacs:

(add-hook 'LaTeX-mode-hook
          (lambda ()
            (LaTeX-add-environments
             '("lem" LaTeX-env-label)
             '("thm" LaTeX-env-label)
             '("defn" LaTeX-env-label)
             '("cor" LaTeX-env-label)
             )
            ))

I also added RefTeX's the trick as follows.

(setq reftex-insert-label-flags '(t t))
(setq reftex-label-alist
     '(("thm" ?h  "thm:" "~\\ref{%s}" t ("theorem" "thm.") -2)
       ("lem" ?l  "lem:" "~\\ref{%s}" t ("lemma"  "lem.") -3)
       ("defn" ?d "def:" "~\\ref{%s}" nil ("definition" "def.") -4)
       ("cor" ?c  "cor:" "~\\ref{%s}" t ("corollary" "cor.") -5)
       ))

When I used "M-x reftex-reference" command and select, for example, "h", it 
listed all the new environments I used, but I could not select labels to 
insert them.  For existing environments like "equation" etc., it works 
perfectly.  How can I make it work?  Thanks.

--
Adam