Can I use the default "signature properties dialog" in DigSig layer?

Hello

I am writing a plug-in about digital signature with the DigSig Layer. I need a  "signature properties dialog" to display info after I verified the signature.

Now my questions :

1. Can I use the default "signature properties dialog" in DigSig layer, just like PubSec's default "signature properties dialog" ?
2. If I want to implement my  own "signature properties dialog", what should I do ?

thanks.