go to both of these and print them out
http://www.realoem.com/bmw/diagrams/r/v/27.png
http://www.realoem.com/bmw/diagrams/r/v/26.png
like you said... try taking the door panel off
then identify the parts in the bottom of the door... what picture what number
for the heck of it. Reach around all of the glass/tracks and stuff and see if you can actuate the paddle that the keyed/handle button moves should come in towards you.
best of luck
_________________
Make it different... or just do it differently
Bill in Petaluma, CA
1969 1600 The current distraction
1970 2002 RIP -- crashed then quartered
1971 2002 M20/02 RIP -- nothing but pieces now
1972 2002 gone, but not missed POS