You might try:

    (require 'ess-eldoc)

-- Mike




>________________________________
>From: Patrick Connolly <p_connolly@slingshot.co.nz>
>To: ESS-help <ess-help@stat.math.ethz.ch>
>Sent: Monday, August 15, 2011 1:57 AM
>Subject: [ESS] ess-r-args-show
>
>Dear ESS genii,
>
>At some stage, I found this bit for my ~/.emacs file which I find very
>useful.
>
>
>;; Show function argument completion while editing R code and
>;; interacting with an inferior R process
>(define-key ess-mode-map [f5] 'ess-r-args-show)
>(define-key ess-mode-map [f6] 'ess-r-args-insert)
>(define-key inferior-ess-mode-map [f5] 'ess-r-args-show)
>(define-key inferior-ess-mode-map [f6] 'ess-r-args-insert)
>
>
>Being a fan of lazy typing, I find it arduous to press the F5 key
>after I've gone to all the bother of typing a function name and then
>an opening bracket.  My question is what would I need to add to the
>.emacs file so that the args appeared as though I'd pressed F5?  I
>seem to remember seeing that happen when a colleague was using Vincent
>Goulet's GNU Emacs Windows distribution.
>
>TIA
>
>
>-- 
>~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.  
>   ___    Patrick Connolly  
>{~._.~}                   Great minds discuss ideas    
>_( Y )_               Average minds discuss events 
>(:_~*~_:)                  Small minds discuss people  
>(_)-(_)                            ..... Eleanor Roosevelt
>      
>~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
>
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>
>
>
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