Fedora 18 keyboard layout conf problem

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http://forums.fedoraforum.org – hi , i have install a week now fedora 18 in my laptop and i have a keyboard layout issue .... i use english and greek keyboard and i can not find at the sys settings the options to use a combination like alt+shift to change the layout of the keyboard. i have been looking to the keyboard settings and i didn't found something.....how can configure this ?? Thanks :) (HowTos)