Trying to write some extensions

I’m trying to write some extension that add menu items and some underlying
functionality. However, when I try to use “$m->dhandler_arg” it is always empty.
I’ve got no clue as to why this is. Should I register the dhandler file
somewhere or is because I use it within a “<%perl>”-section?
I hope someone can give me some pointers.

– Pieter van der Spek,, West Consulting B.V., +31 15 2191 600