About default key used for trustdb

[Faramir]

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Hello:
      Recently, I noticed a key signed by me was not shown as trusted
(using gpgshell GUI). I did a test, and tried to sign the key again, and
found gpg wanted to use a "group key" (a key used by a group of persons
to encrypt/decrypt messages, to protect them while they are in transit),
instead of my personal keys. So, is there a way to tell gpg to "view
keys from one of my keys point of view"? I had noticed this before, but
since it always selected one of my personal keys, and all of them trust
each other, that was never a problem, until now.

     Best Regards
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