tab bypasses field widget

[Geert Ribbers]

Hi.

Defining the next custom-variable gives a strange tab-behaviour:
(defcustom ftp-p
  ""
  "FTP?"
  :tag "Use FTP?"
  :type '(choice
   (const :tag "Don't use FTP" :value nil)
   (const :tag "Default FTP" :value roos-default-ftp-address)
   (string :tag "FTP address")
   )
  )

When trying to tab to the string field that field is bypassed and the cursor
moves to the next button: State.
At least on my W2k installation (Emacs 21.1.1).

Regards, Geert Ribbers