Open ..\data\gui\map.gui.aix and look for eg. "freeplayon". You should find something like this:
Code:
[*] = ; 'moremoney' : MoreMoney;
[*] = ; 'moreleadership' : MoreLeadership;
[*] = ; 'moreexp' : MoreExp;
[*] = ; 'morearmyexp' : MoreArmyExp;
[*] = ; 'morehorses' : MoreHorses;
[*] = ; 'autowinon' : SetBoolValueByName('autowinon', true);
[*] = ; 'autowinoff' : SetBoolValueByName('autowinon', false);
[*] = ; 'freeplayon', 'ynkpnh' : RunFreePlay;
[*] = ; 'mongolsinvasion' : TriggerManagerDoRun;