Not sure what could be wrong. Did you close the bundle editor after changing the scope selector? Try maybe relaunch TM and also try ?Q outside the comment block to see if the command is properly scoped.
I've had this problem with newly created commands for as long as I can remember. The solution is to restart TextMate. The problem only exists with newly created commands.
It's now working, thank you very much, both of you.
Cumprimentos, António Afonso