fail at importing key using gksudo

[valaprgrmr]

This is my command:
gksudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys KEY

And the output is:
gksudo: unrecognized option '--keyserver'

What should I do?
I need the graphic window.

Thanks.

[mikewhatever]

The graphical way of importing keys is under System->Admin->Software Sources, Authentication tab.

[valaprgrmr]

I'm writing a program and I want the user to type the password in the graphical window.

[valaprgrmr]

success with:
gksudo "apt-key adv --keyserver keyserver.ubuntu.com --recv-keys KEY"

I have one more problem executing this:
echo 'deb http://ppa.launchpad.net/team-xbmc/jaunty-ppa/ubuntu jaunty main' | gksudo tee -a /etc/apt/sources.list

it works fine with sudo but not with gksudo.

Thanks.:)