macOS Codesign a widget to get along with gatekeeper

[md11]

Hi
I've got a widget which I have got to sign.
I can sign apps with xcode, but not with dashcode.
I tried the terminal command, codesign worked, but gatekeeper did not accept.
Anybody knows how to do it?
Thanks in advance

 

[md11]

Nobody has a clue, I'm still trying to achieve this