tried to start it with
Exec=osso-xterm "sudo sh /etc/hildon-welcome.d/lalala.sh"
then i'm asked for the root password... -.-

even if i edit my script and write "sudo" before every command which have to be executed as root i'm getting asked for this password....

then i tried "sudo gainroot" as first line of my script.
it opens xterm but my script isn't executed...

it's driving me crazy o.O