GS keypress event args

Hello,

I want to trap keystrokes in a GS editor, which works fine for most keys, but 
when I type, say '^', which is with AltGr/9 on my keyboard, the GS event I get 
is:

{gs,myeditor,keypress,[],[ccedilla,231,0,1]}

and of course I get exactly the same event when I type 'ç' without the AltGr 
key.

Yet in the editor window, the correct symbols are displayed.

Any suggestions?

Regards,

Dominic.