If you received a message signed or encrypted by the sender, you will see a
button with a signature or encryption icon at right of the e-mail view dialog.
While click on it, it will pop up a dialog, "digital signatrue: Valid", and
show the message's subject and sender, and have a "detailed..." and a close
button. If you click on "detailed.."button, it will show "Message Security
Properties".
My question is that Is it possible for me to add such a button, and show the
same dialog(of course, signer may be not same) on it?

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