I had the same issue. I used the file-expand-wildcards function to make a list of all my org-mode files.
The only thing is that I have to reload my .emacs when adding org files for refile to work properly.
From: "Xebar Saram" <address@hidden>
To: "Stefan-W. Hahn" <address@hidden>
Cc: "Kyle Meyer" <address@hidden>, "org mode" <address@hidden>
Sent: Thursday, March 5, 2015 12:50:29 AM
Subject: Re: [O] refiling with helm
thank you all, most of the code here was overkill for me (im very un-technical :)) but i found the last bit of code:
> (setq org-outline-path-complete-in-steps nil)
>
> (require 'helm)
> (require 'helm-config)
> (helm-mode 1)
to work great for me
the only problem remaining is that it seems it does not give me refile option for all my agenda files just a few (which i cant understand why it chooses these). i have this in my refile config:
(setq org-goto-max-level 10)
also i have this in my config
(setq org-agenda-files '("~/org/files/agenda/"))
what am i missing here?
thx alot!
z