Problem with "~"

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http://forums.fedoraforum.org – I have Fedora 12. My keyboard is Spanish as well as my Fedora version. Sometimes I need to write in Portuguese and in this language, I frequently need to write "ã" and "õ". In Windows (all versions) as well as in Mandriva 2008, I can do that with [Alt Gr] + 4 followed by "a" or "o". In Fedora 12 upgraded today, if I do that, I get "~a" or "~o". This is a real inconvenience for me. I like Fedora very much, but if I can not solve this problem, I have to change to another OS, because I can not waste my time, doing continously copy and paste. Help please! (HowTos)