What I do is press it once to "activate" it, and then I press it again + the special character I want to type.
Since
AltGr kind of simulates
CTRL+ALT, one could alternatively press
CTRL+ALT+Special Character, were it not for the
ALT key to halt Minecraft and thus it resorts to the same "activate" method as with
AltGr.
Don't know if anything can be done about that (I doubt it), but what could be done instead is to change the key for the menu to a more seldom used one (Like one of the
F-Keys).
You can actually do that yourself. That is, if you have access to the
/rom/programs/ folder.
If you don't, then you could just copy the edit-program into your CC computer's root folder and change that one instead and from then on use that one as your editor of choice.^^
Anyway, regardless of whatever version you choose, open up the edit-program in an editor and look for this line:
elseif param == 29 then
It should be on line 267.
The number
29 corresponds with the left
CTRL-Key (which is interfering with AltGr).
To change it to e.g. the
F1 key, just replace
29 with
59:
elseif param == 59 then
That's it, now the save menu will only appear on
F1, but not on
AltGr anymore.
Hope it helps, cheers. :unsure:/>/>
P.S.: All valid Minecraft-Keycodes:
http://www.minecraftwiki.net/wiki/Key_Codes