Do Copy/Cut/Paste buttons work in FF at all ?

Can anyone give a hint about this buttons? First, I found a thread in this forum, where people adviced to modify security settings in FF. Well, I did it but it still didn't work. Actually, it did the trick, but not for FCK.
http://www.mozilla.org/editor/midasdemo/ works fine with clipboard after security tuning. I looked at the code and found this:

case 'Paste' :
try { if ( FCK.Paste() ) FCK._BaseExecuteNamedCommand( 'Paste' ) ; }
catch (e) { alert( FCKLang.PasteErrorPaste ) ; }
break ;
case 'Cut' :
try { FCK._BaseExecuteNamedCommand( 'Cut' ) ; }
catch (e) { alert( FCKLang.PasteErrorCut ) ; }
break ;
case 'Copy' :
try { FCK._BaseExecuteNamedCommand( 'Copy' ) ; }
catch (e) { alert( FCKLang.PasteErrorCopy ) ; }
break ;

I'm not a JS guru, but it is very srange that there is no other reference in the whole code to the function FCK._BaseExecuteNamedCommand. This is a strange world...