Accessing FCK vars from outside the Editor with Javascript

Hello

I am working on a multilanguage content editor which uses fckeditor. In the UI there is a tab for each language, and i dynamically set and get the contents of the editor with the GetData and SetData functions. This all works excellently!

Now when the tab is switched and the content in the Editor changes I need to reset the undohistory of the editor in my script.
I did some research and found the following code (context: this -> FCKUndo):

   this.SavedData = new Array() ;
   this.CurrentIndex = -1 ;
   this.TypesCount = 0 ;
   this.Changed = false ;
   this.Typing = false ;
   this.SaveLocked = false ;
   FCK.Events.FireEvent( "OnSelectionChange" ) ; //update undo/redo toolbar btns

Now my problem might seem trivial to solve, but i couldn't manage to find the scope/object where FCKUndo is defined. When i use GetInstance, all i can see is the object Commands.LoadedCommands, and i would not like to use v3 or modify the FCK source myself (and add the resetUndo command to the available commands) but i would like to set the above vars directly.

thanks in advance for any advice where/how to find the objects i am looking for!