Aha!!!!
Yes this brings up a desktop preference window and when I click on the advanced there is the "show menus provided by windows manager when desktop is clicked" option.
However with this selected or unselected nothing changes.
I guess I need to deactivate the option for fluxbox that makes a menu appear on right click....? (not sure how to do that but i'll start looking into it) does that sound like a plan? Or am I overlookng some other thing not instaled like lxmenu or something ???
Thanks again