V tomto pripade vola delphi urcite WinAPI fciu, takze ak postradas popis k triedam Delphi a ak sa google polamalo , tak si to mozes pozriet aj v MSDN
http://msdn.microsoft.com/library/default.asp?url=/ library/en-us/winui/winui/windowsuserinterface/wind owing/dialogboxes/dialogboxreference/dialogboxfunct ions/messagebox.asp
zaujimat ta budu urcite flagy MB_DEFBUTTON1 az 4
BTW. na spajanie flagov odporucam radsej pouzivat bitove or, namiesto matematickeho +