CAPI/CLIM and the mouse wheel

Hi, 

For some time now I have been pondering as to how to get the mouse wheel
working on programs delivered with LispWorks containing a graphical user
interface. Would somebody have some suggestions as to how to get the mouse
wheel scrolling working? We are using CLIM and the program has some rather
large windows where the mouse wheel scrolling would be beneficial. 

For example, there exists "WIN32::WM_MOUSEWHEEL" but I would need some
advice on how to apply it. I guess I would also need to utilize something
like the generic function: read-frame-command [Arguments: frame stream]. So,
it would be very nice if somebody would be able to help or give some tips?
We are using LispWorks 6.0 Professional (32-bit) for Windows. 

With Best Regards, 
Teemu