X and Fluxbox :: need @ on german keyboard

hi,
can you help me getting @ to work.

I don't need the proper function of the "Alt Gr" key (on german keyboard right beside the space) but I need the "@" from time to time ;)
Perhaps there is a way to link the buttons "Shift"+"-" -> @ ?

I tried xmodmap but it didn't work for me. Maybe I did a mistake but I think I read here this wouldn't work with xfree86.dsl

Does someone know xkeycaps.dsl? Can this help me with this problem?
Are there other ways?

Thanks for you patience.
C

edit: I'm using dsl-0.9.2 hd-install

I found
this post

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original here.